feat: enrichment Hub API, feature flags UI/gating, NCM refresher, Agent enrichment worker with tests

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

central/app/main.py

@@ -1,6 +1,7 @@
 """FastAPI application factory."""
 
 import logging
+import sys
 from collections.abc import Callable
 
 from fastapi import FastAPI, HTTPException
@@ -40,6 +41,12 @@ def create_app(database_probe: Callable[[], bool] = database_is_available, sessi
     app.include_router(control_api_router(session_factory))
     app.include_router(agent_distribution_router(session_factory))
     app.include_router(web_router(session_factory))
+    if settings.official_refresh_enabled and session_factory is SessionLocal and "pytest" not in sys.modules:
+        @app.on_event("startup")
+        def _start_official_refresh():
+            from .datasets.updater import start_scheduler
+            start_scheduler(session_factory)
+
     app.mount("/static", StaticFiles(directory="central/static"), name="static")
     return app