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>

migrations.py

@@ -232,14 +232,12 @@ async def m010_add_events_settings(db):
     Create the extension settings singleton row used by the admin UI to
     toggle e.g. auto_approve.
     """
-    await db.execute(
-        """
+    await db.execute("""
         CREATE TABLE IF NOT EXISTS events.settings (
             id INTEGER PRIMARY KEY DEFAULT 1,
             auto_approve BOOLEAN NOT NULL DEFAULT FALSE
         )
-        """
-    )
+        """)
     await db.execute(
         "INSERT INTO events.settings (id, auto_approve) "
         "SELECT 1, FALSE WHERE NOT EXISTS "