feat(models): add org_id to Article, PublishRecord, ContentMetrics, SearchRanking, GeoReadinessScore

- Add org_id column to 5 models with default='default'
- Update to_dict() methods for ContentMetrics, SearchRanking, GeoReadinessScore
- Add ALTER TABLE migrations in database.py init_db()
- Add org_id to 6 Pydantic response schemas
- Add require_role() helper factory in auth.py

.omo/ralph-loop.local.md

@@ -4,10 +4,10 @@ iteration: 1
 max_iterations: 500
 completion_promise: "DONE"
 initial_completion_promise: "DONE"
-started_at: "2026-06-16T23:59:41.756Z"
+started_at: "2026-06-17T06:11:18.800Z"
 session_id: "ses_1dede8a7affeG6DxtfPUOviXrp"
 ultrawork: true
 strategy: "continue"
-message_count_at_start: 8116
+message_count_at_start: 8133
 ---
-开始全面改造，包括数据隔离与权限工作，改造实施并发数不要超过3
+全部按照你的建议执行启动