fix(events): use g.user.id instead of g.user_id in route helper

auth.py sets g.user (the User object), not g.user_id directly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/fabledassistant/routes/events.py

@@ -12,7 +12,7 @@ events_bp = Blueprint("events", __name__, url_prefix="/api/events")
 
 
 def _get_current_user_id() -> int:
-    return g.user_id
+    return g.user.id
 
 
 @events_bp.get("")