fix: address PR #836 review — forward task_producer to MCP contexts + cleanups

🔴 nc_get_vector_sync_status reported pending=0 for INGEST_QUEUE=postgres: the
AppContext/OAuthAppContext per-session yields snapshotted the stream fields but
never forwarded task_producer, so lifespan_ctx.task_producer was always None.
Convert task_producer to a @property that reads _vector_sync_state live (like
eviction_task_group), removing the snapshot field so the yields can't drop it.
Add a regression test pinning the contract on both contexts.

🟡 Remove the unused _RECLAIM_TASK_NAME constant.
🟡 get_procrastinate_conninfo: warn + document that DATABASE_URL query params
   (application_name, connect_timeout, …) are dropped.
🟡 worker: open the procrastinate App once — apply_ingest_queue_schema gains
   manage_connection=False so the worker reuses its own open connector instead
   of a redundant open/close before run_worker_async.

🟢 Clarify the apply-schema broad-except comment (non-race errors re-raise) and
   document the deliberate Any typing in ingest_status.get_ingest_pending.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

nextcloud_mcp_server/config.py

@@ -1437,6 +1437,13 @@ def get_procrastinate_conninfo(database_url: str | None = None) -> str:
     (set ``DATABASE_URL`` to a ``+psycopg`` URL) rather than rewriting the driver
     in code — see charts repo, not this repo.
 
+    Only the host/port/dbname/user/password components are forwarded; any
+    ``?key=value`` query parameters on the URL (e.g. ``application_name``,
+    ``connect_timeout``) are **dropped** — TLS is set separately via
+    :func:`_pg_ssl_params`, and SQLAlchemy-specific query options don't map
+    cleanly to libpq keywords. A warning is logged when params are dropped so
+    operators aren't surprised.
+
     Raises ``ValueError`` for a non-Postgres URL — procrastinate is Postgres-only.
     """
     from psycopg.conninfo import make_conninfo  # noqa: PLC0415
@@ -1449,6 +1456,13 @@ def get_procrastinate_conninfo(database_url: str | None = None) -> str:
             f"got driver {url.drivername!r}"
         )
 
+    if url.query:
+        logging.getLogger(__name__).warning(
+            "Dropping DATABASE_URL query parameters not forwarded to the "
+            "procrastinate connector: %s",
+            ", ".join(sorted(url.query)),
+        )
+
     params: dict[str, str] = {}
     if url.host:
         params["host"] = url.host