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/tasks/log_cleanup.py

@@ -0,0 +1,56 @@
+"""
+日志清理定时任务
+"""
+import logging
+from datetime import datetime, timedelta
+
+from app.core.celery_app import celery_app
+from app.core.database import SessionLocal
+from app.core.config import settings
+from app.models.execution_log import ExecutionLog
+from app.models.agent_execution_log import AgentExecutionLog
+from app.models.agent_llm_log import AgentLLMLog
+from app.models.audit_log import AuditLog
+
+logger = logging.getLogger(__name__)
+
+# 需要清理的模型及其时间列
+_CLEANUP_TARGETS: list[tuple[type, str]] = [
+    (ExecutionLog, "timestamp"),
+    (AgentExecutionLog, "created_at"),
+    (AgentLLMLog, "created_at"),
+    (AuditLog, "created_at"),
+]
+
+
+@celery_app.task(name="cleanup_old_logs")
+def cleanup_old_logs() -> dict:
+    """清理超过保留期的数据库日志记录"""
+    retention_days = settings.LOG_RETENTION_DAYS
+    cutoff = datetime.utcnow() - timedelta(days=retention_days)
+
+    db = SessionLocal()
+    result = {"status": "ok", "retention_days": retention_days, "deleted": {}}
+
+    try:
+        for model, time_col_name in _CLEANUP_TARGETS:
+            time_col = getattr(model, time_col_name)
+            count = db.query(model).filter(time_col < cutoff).delete()
+            result["deleted"][model.__tablename__] = count
+            if count > 0:
+                logger.info(
+                    "[日志清理] %s: 删除 %d 条（%s 之前的记录）",
+                    model.__tablename__, count, cutoff.isoformat()
+                )
+
+        db.commit()
+        logger.info("[日志清理] 完成，总计删除 %d 条记录", sum(result["deleted"].values()))
+    except Exception as e:
+        db.rollback()
+        logger.error("[日志清理] 失败: %s", e)
+        result["status"] = "failed"
+        result["error"] = str(e)
+    finally:
+        db.close()
+
+    return result