feat: Add Health Monitoring to Portfolio page

PORTFOLIO HEALTH MONITORING:
- Added 'Health' column to portfolio table
- Health check button with SSL, DNS, HTTP analysis
- Full Health Report Modal with:
  - DNS Infrastructure (NS, A, MX records)
  - Website Status (reachable, HTTP status)
  - SSL Certificate (valid, expiry days)
  - Signals & Recommendations
- Uses quickHealthCheck API for any domain
- Status badges: Healthy, Weak, Parked, Critical

FEATURE STATUS CHECK:
✅ My Listings (/command/listings):
   - Create listings with domain verification
   - DNS-based verification
   - Public listing pages
   - Inquiry management

✅ Sniper Alerts (/command/alerts):
   - Custom filters (TLD, length, price, keywords)
   - No numbers/hyphens options
   - Email notification toggle
   - Test alert functionality
   - Match history

✅ SEO Juice (/command/seo):
   - Domain SEO analysis
   - Domain Authority, Backlinks
   - Notable links (Wikipedia, Gov, Edu)
   - Top backlinks list
   - Tycoon-only feature

frontend/src/app/command/portfolio/page.tsx

@@ -2,7 +2,7 @@
 
 import { useEffect, useState } from 'react'
 import { useStore } from '@/lib/store'
-import { api, PortfolioDomain, PortfolioSummary, DomainValuation } from '@/lib/api'
+import { api, PortfolioDomain, PortfolioSummary, DomainValuation, DomainHealthReport, HealthStatus } from '@/lib/api'
 import { CommandCenterLayout } from '@/components/CommandCenterLayout'
 import { PremiumTable, StatCard, PageContainer, TableActionButton } from '@/components/PremiumTable'
 import { Toast, useToast } from '@/components/Toast'
@@ -22,7 +22,24 @@ import {
   Briefcase,
   PiggyBank,
   ShoppingCart,
+  Activity,
+  Shield,
+  AlertTriangle,
 } from 'lucide-react'
+
+// Health status configuration
+const healthStatusConfig: Record<HealthStatus, { 
+  label: string
+  color: string
+  bgColor: string
+  icon: typeof Activity
+}> = {
+  healthy: { label: 'Healthy', color: 'text-accent', bgColor: 'bg-accent/10', icon: Activity },
+  weakening: { label: 'Weak', color: 'text-amber-400', bgColor: 'bg-amber-400/10', icon: AlertTriangle },
+  parked: { label: 'Parked', color: 'text-orange-400', bgColor: 'bg-orange-400/10', icon: ShoppingCart },
+  critical: { label: 'Critical', color: 'text-red-400', bgColor: 'bg-red-400/10', icon: AlertTriangle },
+  unknown: { label: 'Unknown', color: 'text-foreground-muted', bgColor: 'bg-foreground/5', icon: Activity },
+}
 import clsx from 'clsx'
 import Link from 'next/link'
 
@@ -44,6 +61,11 @@ export default function PortfolioPage() {
   const [savingEdit, setSavingEdit] = useState(false)
   const [processingSale, setProcessingSale] = useState(false)
   const [refreshingId, setRefreshingId] = useState<number | null>(null)
+  
+  // Health monitoring state
+  const [healthReports, setHealthReports] = useState<Record<string, DomainHealthReport>>({})
+  const [loadingHealth, setLoadingHealth] = useState<Record<string, boolean>>({})
+  const [selectedHealthDomain, setSelectedHealthDomain] = useState<string | null>(null)
 
   const [addForm, setAddForm] = useState({
     domain: '',
@@ -183,6 +205,21 @@ export default function PortfolioPage() {
     }
   }
 
+  const handleHealthCheck = async (domainName: string) => {
+    if (loadingHealth[domainName]) return
+    
+    setLoadingHealth(prev => ({ ...prev, [domainName]: true }))
+    try {
+      const report = await api.quickHealthCheck(domainName)
+      setHealthReports(prev => ({ ...prev, [domainName]: report }))
+      setSelectedHealthDomain(domainName)
+    } catch (err: any) {
+      showToast(err.message || 'Health check failed', 'error')
+    } finally {
+      setLoadingHealth(prev => ({ ...prev, [domainName]: false }))
+    }
+  }
+
   const handleDelete = async (domain: PortfolioDomain) => {
     if (!confirm(`Remove ${domain.domain} from your portfolio?`)) return
 
@@ -345,12 +382,55 @@ export default function PortfolioPage() {
                 )
               ),
             },
+            {
+              key: 'health',
+              header: 'Health',
+              hideOnMobile: true,
+              render: (domain) => {
+                const report = healthReports[domain.domain]
+                if (loadingHealth[domain.domain]) {
+                  return <Loader2 className="w-4 h-4 text-foreground-muted animate-spin" />
+                }
+                if (report) {
+                  const config = healthStatusConfig[report.status]
+                  const Icon = config.icon
+                  return (
+                    <button
+                      onClick={() => setSelectedHealthDomain(domain.domain)}
+                      className={clsx(
+                        "inline-flex items-center gap-1.5 px-2 py-1 rounded-lg text-xs font-medium",
+                        config.bgColor, config.color
+                      )}
+                    >
+                      <Icon className="w-3 h-3" />
+                      {config.label}
+                    </button>
+                  )
+                }
+                return (
+                  <button
+                    onClick={() => handleHealthCheck(domain.domain)}
+                    className="text-xs text-foreground-muted hover:text-accent transition-colors flex items-center gap-1"
+                  >
+                    <Activity className="w-3.5 h-3.5" />
+                    Check
+                  </button>
+                )
+              },
+            },
             {
               key: 'actions',
               header: '',
               align: 'right',
               render: (domain) => (
                 <div className="flex items-center gap-1 justify-end">
+                  <TableActionButton
+                    icon={Shield}
+                    onClick={() => handleHealthCheck(domain.domain)}
+                    loading={loadingHealth[domain.domain]}
+                    title="Health check (SSL, DNS, HTTP)"
+                    variant={healthReports[domain.domain] ? 'accent' : 'default'}
+                  />
                   <TableActionButton
                     icon={Sparkles}
                     onClick={() => handleValuate(domain)}
@@ -583,10 +663,218 @@ export default function PortfolioPage() {
           ) : null}
         </Modal>
       )}
+
+      {/* Health Report Modal */}
+      {selectedHealthDomain && healthReports[selectedHealthDomain] && (
+        <HealthReportModal 
+          report={healthReports[selectedHealthDomain]} 
+          onClose={() => setSelectedHealthDomain(null)} 
+        />
+      )}
     </CommandCenterLayout>
   )
 }
 
+// Health Report Modal Component
+function HealthReportModal({ report, onClose }: { report: DomainHealthReport; onClose: () => void }) {
+  const config = healthStatusConfig[report.status]
+  const Icon = config.icon
+
+  return (
+    <div 
+      className="fixed inset-0 z-50 bg-background/80 backdrop-blur-sm flex items-center justify-center p-4"
+      onClick={onClose}
+    >
+      <div 
+        className="w-full max-w-lg bg-background-secondary border border-border/50 rounded-2xl shadow-2xl overflow-hidden"
+        onClick={(e) => e.stopPropagation()}
+      >
+        {/* Header */}
+        <div className="flex items-center justify-between p-5 border-b border-border/50">
+          <div className="flex items-center gap-3">
+            <div className={clsx("p-2 rounded-lg", config.bgColor)}>
+              <Icon className={clsx("w-5 h-5", config.color)} />
+            </div>
+            <div>
+              <h3 className="font-mono font-semibold text-foreground">{report.domain}</h3>
+              <p className={clsx("text-xs font-medium", config.color)}>{config.label}</p>
+            </div>
+          </div>
+          <button onClick={onClose} className="p-1 text-foreground-muted hover:text-foreground transition-colors">
+            <X className="w-5 h-5" />
+          </button>
+        </div>
+
+        {/* Score */}
+        <div className="p-5 border-b border-border/30">
+          <div className="flex items-center justify-between">
+            <span className="text-sm text-foreground-muted">Health Score</span>
+            <div className="flex items-center gap-3">
+              <div className="w-32 h-2 bg-foreground/10 rounded-full overflow-hidden">
+                <div 
+                  className={clsx(
+                    "h-full rounded-full transition-all",
+                    report.score >= 70 ? "bg-accent" :
+                    report.score >= 40 ? "bg-amber-400" : "bg-red-400"
+                  )}
+                  style={{ width: `${report.score}%` }}
+                />
+              </div>
+              <span className={clsx(
+                "text-lg font-bold tabular-nums",
+                report.score >= 70 ? "text-accent" :
+                report.score >= 40 ? "text-amber-400" : "text-red-400"
+              )}>
+                {report.score}/100
+              </span>
+            </div>
+          </div>
+        </div>
+
+        {/* Check Results */}
+        <div className="p-5 space-y-4">
+          {/* DNS */}
+          {report.dns && (
+            <div className="p-4 bg-foreground/5 rounded-xl">
+              <h4 className="text-sm font-medium text-foreground mb-2 flex items-center gap-2">
+                <span className={clsx(
+                  "w-2 h-2 rounded-full",
+                  report.dns.has_ns && report.dns.has_a ? "bg-accent" : "bg-red-400"
+                )} />
+                DNS Infrastructure
+              </h4>
+              <div className="grid grid-cols-3 gap-2 text-xs">
+                <div className="flex items-center gap-1.5">
+                  <span className={report.dns.has_ns ? "text-accent" : "text-red-400"}>
+                    {report.dns.has_ns ? '✓' : '✗'}
+                  </span>
+                  <span className="text-foreground-muted">Nameservers</span>
+                </div>
+                <div className="flex items-center gap-1.5">
+                  <span className={report.dns.has_a ? "text-accent" : "text-red-400"}>
+                    {report.dns.has_a ? '✓' : '✗'}
+                  </span>
+                  <span className="text-foreground-muted">A Record</span>
+                </div>
+                <div className="flex items-center gap-1.5">
+                  <span className={report.dns.has_mx ? "text-accent" : "text-foreground-muted"}>
+                    {report.dns.has_mx ? '✓' : '—'}
+                  </span>
+                  <span className="text-foreground-muted">MX Record</span>
+                </div>
+              </div>
+              {report.dns.is_parked && (
+                <p className="mt-2 text-xs text-orange-400">⚠ Parked at {report.dns.parking_provider || 'unknown provider'}</p>
+              )}
+            </div>
+          )}
+
+          {/* HTTP */}
+          {report.http && (
+            <div className="p-4 bg-foreground/5 rounded-xl">
+              <h4 className="text-sm font-medium text-foreground mb-2 flex items-center gap-2">
+                <span className={clsx(
+                  "w-2 h-2 rounded-full",
+                  report.http.is_reachable && report.http.status_code === 200 ? "bg-accent" : 
+                  report.http.is_reachable ? "bg-amber-400" : "bg-red-400"
+                )} />
+                Website Status
+              </h4>
+              <div className="flex items-center gap-4 text-xs">
+                <span className={clsx(
+                  report.http.is_reachable ? "text-accent" : "text-red-400"
+                )}>
+                  {report.http.is_reachable ? 'Reachable' : 'Unreachable'}
+                </span>
+                {report.http.status_code && (
+                  <span className="text-foreground-muted">
+                    HTTP {report.http.status_code}
+                  </span>
+                )}
+              </div>
+              {report.http.is_parked && (
+                <p className="mt-2 text-xs text-orange-400">⚠ Parking page detected</p>
+              )}
+            </div>
+          )}
+
+          {/* SSL */}
+          {report.ssl && (
+            <div className="p-4 bg-foreground/5 rounded-xl">
+              <h4 className="text-sm font-medium text-foreground mb-2 flex items-center gap-2">
+                <span className={clsx(
+                  "w-2 h-2 rounded-full",
+                  report.ssl.has_certificate && report.ssl.is_valid ? "bg-accent" : 
+                  report.ssl.has_certificate ? "bg-amber-400" : "bg-foreground-muted"
+                )} />
+                SSL Certificate
+              </h4>
+              <div className="text-xs">
+                {report.ssl.has_certificate ? (
+                  <div className="space-y-1">
+                    <p className={report.ssl.is_valid ? "text-accent" : "text-red-400"}>
+                      {report.ssl.is_valid ? '✓ Valid certificate' : '✗ Certificate invalid/expired'}
+                    </p>
+                    {report.ssl.days_until_expiry !== undefined && (
+                      <p className={clsx(
+                        report.ssl.days_until_expiry > 30 ? "text-foreground-muted" :
+                        report.ssl.days_until_expiry > 7 ? "text-amber-400" : "text-red-400"
+                      )}>
+                        Expires in {report.ssl.days_until_expiry} days
+                      </p>
+                    )}
+                  </div>
+                ) : (
+                  <p className="text-foreground-muted">No SSL certificate</p>
+                )}
+              </div>
+            </div>
+          )}
+
+          {/* Signals & Recommendations */}
+          {((report.signals?.length || 0) > 0 || (report.recommendations?.length || 0) > 0) && (
+            <div className="space-y-3">
+              {(report.signals?.length || 0) > 0 && (
+                <div>
+                  <h4 className="text-xs font-medium text-foreground-muted uppercase tracking-wider mb-2">Signals</h4>
+                  <ul className="space-y-1">
+                    {report.signals?.map((signal, i) => (
+                      <li key={i} className="text-xs text-foreground flex items-start gap-2">
+                        <span className="text-accent mt-0.5">•</span>
+                        {signal}
+                      </li>
+                    ))}
+                  </ul>
+                </div>
+              )}
+              {(report.recommendations?.length || 0) > 0 && (
+                <div>
+                  <h4 className="text-xs font-medium text-foreground-muted uppercase tracking-wider mb-2">Recommendations</h4>
+                  <ul className="space-y-1">
+                    {report.recommendations?.map((rec, i) => (
+                      <li key={i} className="text-xs text-foreground flex items-start gap-2">
+                        <span className="text-amber-400 mt-0.5">→</span>
+                        {rec}
+                      </li>
+                    ))}
+                  </ul>
+                </div>
+              )}
+            </div>
+          )}
+        </div>
+
+        {/* Footer */}
+        <div className="p-4 bg-foreground/5 border-t border-border/30">
+          <p className="text-xs text-foreground-subtle text-center">
+            Checked at {new Date(report.checked_at).toLocaleString()}
+          </p>
+        </div>
+      </div>
+    </div>
+  )
+}
+
 // Modal Component
 function Modal({ title, children, onClose }: { title: string; children: React.ReactNode; onClose: () => void }) {
   return (