fix: delete agent 500 error + dynamic personality + deployment guide

- Fix delete agent 500: clean up FK records (agent_llm_logs, permissions,
  schedules, executions, team_members) and unbind goals/tasks before delete
- Remove hardcoded personality templates in Android, replace with dynamic
  system prompt generation from name + description
- Set promptSectionsEnabled=false to bypass PromptComposer for personality
- Add Tencent Cloud Linux deployment guide (Docker Compose)
- Accumulated backend service updates, frontend UI fixes, Android app changes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/app/core/database.py

@@ -69,4 +69,11 @@ def init_db():
     import app.models.user_feishu_open_id
     import app.models.user_fingerprint
     import app.models.workflow_version
+    import app.models.audit_log
+    import app.models.conversation_branch
+    import app.models.push_subscription
+    import app.models.fcm_token
+    import app.models.workspace
+    import app.models.scene_contract
+    import app.models.team
     Base.metadata.create_all(bind=engine)