feat: improve cloud sync reliability and background status

src/mi_fitness_mcp/storage/__init__.py

@@ -581,7 +581,6 @@ class Database:
             conn.commit()
             return cursor.rowcount > 0
 
-
     def update_sync_state(self, data_type: str, last_record_ts: datetime | None = None) -> None:
         """Update sync state for a data type."""
         with self._get_connection() as conn:
@@ -857,7 +856,6 @@ class Database:
                     }
                 )
 
-
             for data_type, table_name, date_expr in [
                 ("spo2", "spo2_samples", "timestamp"),
                 ("stress", "stress_samples", "timestamp"),