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/celery_app.py

@@ -14,6 +14,7 @@ celery_app = Celery(
         "app.tasks.agent_tasks",
         "app.tasks.scheduler_tasks",
         "app.tasks.goal_tasks",
+        "app.tasks.knowledge_tasks",
     ]
 )
 
@@ -34,4 +35,8 @@ celery_app.conf.beat_schedule = {
         "task": "app.tasks.scheduler_tasks.check_agent_schedules_task",
         "schedule": crontab(minute="*"),  # 每分钟检查
     },
+    "extract-knowledge-every-hour": {
+        "task": "app.tasks.knowledge_tasks.extract_knowledge_task",
+        "schedule": crontab(minute="0"),  # 每小时整点执行
+    },
 }