fix: WebSocket 403 — require_active_plugin skips WebSocket requests

Simpler approach: require_active_plugin._check() now accepts Request
parameter and returns early for WebSocket upgrade requests.
No route splitting needed — all routes stay in their original router.

app/deps.py

@@ -237,7 +237,11 @@ def require_active_plugin(plugin_name: str):
     already have their own auth dependencies (require_permission, etc.).
     This check only verifies plugin activation status.
     """
-    async def _check() -> None:
+    async def _check(request: Request) -> None:
+        # Skip plugin check for WebSocket connections — WS auth is handled
+        # inside the endpoint itself via session cookie verification.
+        if request.headers.get("upgrade", "").lower() == "websocket":
+            return
         from app.core.permission_registry import get_permission_registry
         try:
             registry = get_permission_registry()

app/main.py

@@ -439,27 +439,17 @@ def create_app() -> FastAPI:
                             # Skip WebSocket routes — the wrapper breaks WS parameter
                             # resolution and returns JSONResponse instead of WS close.
                             from starlette.routing import WebSocketRoute
-                            http_routes = []
-                            ws_routes = []
                             for route in router.routes:
                                 if isinstance(route, WebSocketRoute):
-                                    ws_routes.append(route)
-                                else:
+                                    continue
                                 if hasattr(route, 'endpoint'):
                                     route.endpoint = wrap_plugin_route(route.endpoint)
-                                    http_routes.append(route)
-                            # Register HTTP routes with active-plugin check
-                            router.routes = http_routes
+                            # Add active-plugin check as a router-level dependency
+                            # (require_active_plugin skips WebSocket requests internally)
                             app.include_router(
                                 router,
                                 dependencies=[Depends(require_active_plugin(plugin_name))],
                             )
-                            # Register WebSocket routes WITHOUT active-plugin check
-                            # (WebSocket auth is handled inside the endpoint itself)
-                            if ws_routes:
-                                ws_router = APIRouter()
-                                ws_router.routes = ws_routes
-                                app.include_router(ws_router)
                         except Exception as exc:
                             logger.error(f"Failed to register route {route_def.module}.{route_def.router_attr}: {exc}")
                     break