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>

nostr_publisher.py

@@ -41,7 +41,7 @@ def build_nip52_event(event: Event, pubkey: str) -> NostrEvent:
         tags.append(["image", event.banner])
     if event.location:
         tags.append(["location", event.location])
-    for cat in (event.categories or []):
+    for cat in event.categories or []:
         tags.append(["t", cat])
 
     nostr_event = NostrEvent(