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_sync.py

@@ -50,7 +50,7 @@ async def _handle_calendar_event(nostr_client: NostrClient, event_data: dict):
         return
 
     tags = {t[0]: t[1] for t in event_data.get("tags", []) if len(t) >= 2}
-    tag_lists = {}
+    tag_lists: dict[str, list[str]] = {}
     for t in event_data.get("tags", []):
         if len(t) >= 2:
             tag_lists.setdefault(t[0], []).append(t[1])
@@ -137,9 +137,11 @@ async def wait_for_nostr_events(nostr_client: NostrClient):
     while True:
         try:
             # Subscribe to NIP-52 calendar events
-            await nostr_client.subscribe([
-                {"kinds": [31922, 31923]},
-            ])
+            await nostr_client.subscribe(
+                [
+                    {"kinds": [31922, 31923]},
+                ]
+            )
 
             # Process incoming events
             while True: