chore: satisfy upstream lint (black, mypy, prettier, ruff)

- black/prettier reformatting across new aio code
- type annotations on db.fetchone/fetchall callsites in crud.py
- explicit dict[str, list[str]] for tag_lists in nostr_sync.py
- type:ignore[attr-defined] on Account.prvkey access — the field is
  added by the aio-fork lnbits.core.models.Account; upstream lnbits
  does not yet have it, so consumers without the fork must add a
  prvkey column to accounts before the Nostr publisher can sign.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

__init__.py

@@ -75,9 +75,7 @@ def events_start():
         except Exception as exc:
             logger.error(f"[EVENTS] Nostr sync task failed: {exc}")
 
-    task3 = create_permanent_unique_task(
-        "ext_events_nostr_sync", _sync_nostr_events
-    )
+    task3 = create_permanent_unique_task("ext_events_nostr_sync", _sync_nostr_events)
     scheduled_tasks.append(task3)