feat: add authentication and user management with Authentik integration

- Add PostgreSQL database with async SQLAlchemy
- Add Alembic migrations for schema management
- Add User, Role, UserPreferences, ApiKey models
- Add auth endpoints: /auth/me, /auth/users, /auth/users/sync-from-authentik
- Add token validation via Authentik userinfo endpoint
- Add bulk user sync from Authentik admin API
- Add database health check to diagnostics

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/controllers/health_controller.py

@@ -10,6 +10,7 @@ from src.controllers.base import BaseController
 from src.config import get_settings
 from src.logging_config import get_logger
 from src.models.ollama_client import get_ollama_client
+from src.db import get_database
 
 
 
@@ -59,18 +60,15 @@ class HealthController(BaseController):
         )
         async def health_check():
             """
-            Simple health check endpoint for container orchestration
+            Fast health check endpoint for container orchestration
 
-            Returns a 200 OK status when the service is running properly.
-            Used by Docker, Kubernetes, and load balancers.
+            Returns a 200 OK immediately if the service is running.
+            Does NOT check backend connectivity (use /health/full for that).
+            Used by Docker, Kubernetes, and load balancers for liveness probes.
             """
-            ollama_client = get_ollama_client()
-            ollama_healthy = await ollama_client.health_check()
-
             return {
                 "status": "healthy",
-                "version": settings.app_version,
-                "ollama_connected": ollama_healthy
+                "version": settings.app_version
             }
 
         @router.get(
@@ -131,7 +129,18 @@ class HealthController(BaseController):
                 ollama_error = str(e)
                 logger.warning(f"Ollama health check failed: {ollama_error}")
 
-            is_healthy = ollama_healthy
+            # Check 2: Database connection
+            database = get_database()
+            db_healthy = False
+            db_error = None
+
+            try:
+                db_healthy = await database.health_check()
+            except Exception as e:
+                db_error = str(e)
+                logger.warning(f"Database health check failed: {db_error}")
+
+            is_healthy = ollama_healthy and db_healthy
 
             elapsed_ms = int((time.time() - start_time) * 1000)
             status_code = 200 if is_healthy else 503
@@ -149,6 +158,10 @@ class HealthController(BaseController):
                             "available": False
                         },
                         "error": ollama_error
+                    },
+                    "database": {
+                        "status": "✅ healthy" if db_healthy else "❌ unhealthy",
+                        "error": db_error
                     }
                 }
             }