fix(backfill): init sqlite before reading settings

Script failed with "SQLite not initialized" because module-level connection
state wasn't set up when invoked standalone.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/backfill_order_items.py

@@ -84,6 +84,7 @@ async def _backfill_one(order_number: str, app_settings: dict, use_oracle: bool)
 
 
 async def main(order_numbers: list[str]):
+    database.init_sqlite()
     app_settings = await sqlite_service.get_app_settings()
 
     use_oracle = False