fix(runtime): wrap ingest_enabled gate so _persist_to_db never raises

Move the store.ingest_enabled() gate inside the main try/except. Previously
it sat outside as a standalone block: ingest_enabled() -> _load_pg_config()
raises FileNotFoundError when config.yaml is absent/malformed, which escaped
_persist_to_db, was caught by dispatch_task's outer except, and flipped a
successful download to FAILED -- violating the hook's never-raise invariant.
Now config errors print a [warn], record ok=False, and return silently.

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

inbound_verify/runtime.py

@@ -544,10 +544,10 @@ def _persist_to_db(site, kind):
     except Exception as e:
         print(f">> [warn] 入库模块不可用: {e}")
         return
-    if not store.ingest_enabled():
+    try:
+        if not store.ingest_enabled():  # 移入 try：config.yaml 缺失/损坏时也不外抛
             print(">> [入库] 已关闭 (auto_ingest=false)，跳过")
             return
-    try:
         count = store.ingest_task(site, kind)
         state_store.set_ingest_state(site, kind, ok=True, count=count)
         print(f">> [入库] {site}/{kind} 成功，{count} 条")