feat: add temporal context and contextual help

src/govoplan_core/server/fastapi.py

@@ -17,6 +17,7 @@ from govoplan_core.core.registry import PlatformRegistry
 from govoplan_core.db.query_metrics import collect_query_metrics
 from govoplan_core.server.conditional_requests import conditional_json_get_middleware
 from govoplan_core.server.request_limits import RequestBodyLimitMiddleware
+from govoplan_core.server.temporal import temporal_data_context_middleware
 
 LifespanFactory = Callable[[FastAPI], AbstractAsyncContextManager[None] | AsyncIterator[None]]
 logger = logging.getLogger("govoplan.request")
@@ -169,6 +170,7 @@ def create_govoplan_app(
             return response
 
     app.middleware("http")(conditional_json_get_middleware)
+    app.middleware("http")(temporal_data_context_middleware)
 
     origins = [item.strip() for item in cors_origins if item.strip()]
     if origins: