feat: Wave 2 - API org isolation + factory.html + insights.html

- Add org_id auto-population to articles.py, publishing.py, metrics.py
- Add org_id filtering to search_rankings.py geo endpoints
- Add org_id to calendar.py create/update/delete endpoints
- Add org_id to tasks.py create endpoints
- Create factory.html content pipeline page (3-tab: 待创作/进行中/待审查)
- Create insights.html analytics page (4-tab: 概览/搜索排名/GEO/平台对比)

platform/backend/app/api/publishing.py

@@ -69,7 +69,8 @@ async def create_publish_record(
                     action='publish',
                     status='success',
                     operator=operator,
-                    description=f"选题 {req.topic_id} 发布到 {PLATFORM_LABELS.get(platform, platform)}"
+                    description=f"选题 {req.topic_id} 发布到 {PLATFORM_LABELS.get(platform, platform)}",
+                    org_id=topic.org_id
                 )
                 db.add(record)
                 results.append(PublishResult(