fix: import urllib.parse on the retire path (NameError broke the sweep)

app/main.py

@@ -978,6 +978,7 @@ async def sync_matrix_space() -> dict:
             # accept-able from a lingering client notification, which defeats
             # the one-identity rule. Revoke invites via state-event membership
             # (kick 403s on invite-state users).
+            import urllib.parse  # local import: only needed on this retire path
             for room in [MATRIX_SPACE_ID] + ([MATRIX_GENERAL_ROOM] if MATRIX_GENERAL_ROOM else []):
                 enc_room = urllib.parse.quote(room, safe="")
                 if local_mxid in joined: