fix: Add dig to Docker, fix admin sync endpoints

- Added dnsutils (dig) to backend Dockerfile for DNS zone transfers
- Fixed admin zone sync endpoints with correct imports
- AsyncSessionLocal instead of async_session_maker

backend/Dockerfile

@@ -12,8 +12,10 @@ RUN groupadd -r pounce && useradd -r -g pounce pounce
 WORKDIR /app
 
 # Install system dependencies
+# dnsutils provides 'dig' for DNS zone transfers (AXFR)
 RUN apt-get update && apt-get install -y --no-install-recommends \
     curl \
+    dnsutils \
     && rm -rf /var/lib/apt/lists/*
 
 # Install Python dependencies

backend/app/api/admin.py

@@ -1743,11 +1743,12 @@ async def trigger_switch_sync(
     from app.services.zone_file import ZoneFileService
     
     async def run_sync():
+        from app.database import AsyncSessionLocal
+        async with AsyncSessionLocal() as session:
             zf = ZoneFileService()
-        from app.database import async_session_maker
-        async with async_session_maker() as session:
-            result = await zf.sync_all_zones(session)
-            return result
+            for tld in ["ch", "li"]:
+                await zf.run_daily_sync(session, tld)
+            return {"status": "complete"}
     
     background_tasks.add_task(run_sync)
     
@@ -1770,9 +1771,9 @@ async def trigger_czds_sync(
     from app.services.czds_client import CZDSClient
     
     async def run_sync():
+        from app.database import AsyncSessionLocal
+        async with AsyncSessionLocal() as session:
             client = CZDSClient()
-        from app.database import async_session_maker
-        async with async_session_maker() as session:
             result = await client.sync_all_zones(session)
             return result