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/tests/conftest.py

@@ -23,6 +23,9 @@ import app.models.agent_llm_log  # noqa: F401
 import app.models.agent_vector_memory  # noqa: F401
 import app.models.knowledge_base  # noqa: F401
 import app.models.tool  # noqa: F401
+import app.models.agent_execution_log  # noqa: F401
+import app.models.knowledge_entry  # noqa: F401
+import app.models.feedback_record  # noqa: F401
 
 assert len(_Base.metadata.tables) > 0, "没有模型表被注册"