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/logging_config.py

@@ -0,0 +1,76 @@
+"""
+JSON 结构化日志配置 — 用于 ELK 日志聚合。
+
+用法: 在 main.py 启动时调用 setup_json_logging() 即可。
+会在 logs/ 目录下并行输出 app.json.log（JSON 格式）。
+现有文本格式日志不受影响。
+"""
+from __future__ import annotations
+
+import json
+import logging
+import os
+from datetime import datetime, timezone
+from logging.handlers import RotatingFileHandler
+from pathlib import Path
+from typing import Any
+
+from app.core.config import settings
+
+
+class JsonFormatter(logging.Formatter):
+    """将日志记录格式化为单行 JSON，便于 Filebeat → Elasticsearch 采集。"""
+
+    def format(self, record: logging.LogRecord) -> str:
+        log_entry: dict[str, Any] = {
+            "timestamp": datetime.fromtimestamp(
+                record.created, tz=timezone.utc
+            ).isoformat(),
+            "level": record.levelname,
+            "logger": record.name,
+            "message": record.getMessage(),
+            "module": record.module,
+            "function": record.funcName,
+            "line": record.lineno,
+        }
+
+        # 异常信息
+        if record.exc_info and record.exc_info[1]:
+            log_entry["exception"] = self.formatException(record.exc_info)
+
+        # 上下文字段（如 request_id / user_id）
+        for key in ("request_id", "user_id", "workspace_id", "client_ip", "method", "path", "status_code", "duration_ms"):
+            val = getattr(record, key, None)
+            if val is not None:
+                log_entry[key] = val
+
+        return json.dumps(log_entry, ensure_ascii=False, default=str)
+
+
+def setup_json_logging() -> None:
+    """为 root logger 添加 JSON 格式的 RotatingFileHandler。
+
+    日志写入 LOG_DIR/app.json.log，大小达到 LOG_MAX_BYTES 时轮转。
+    """
+    log_dir = Path(settings.LOG_DIR)
+    log_dir.mkdir(parents=True, exist_ok=True)
+
+    json_log_path = log_dir / "app.json.log"
+
+    # 避免重复添加（uvicorn reload 时会重新执行 startup）
+    root = logging.getLogger()
+    for h in root.handlers:
+        if isinstance(h, RotatingFileHandler) and str(json_log_path) in getattr(h, 'baseFilename', ''):
+            return
+
+    handler = RotatingFileHandler(
+        json_log_path,
+        maxBytes=settings.LOG_MAX_BYTES,
+        backupCount=settings.LOG_BACKUP_COUNT,
+        encoding="utf-8",
+    )
+    handler.setFormatter(JsonFormatter())
+    handler.setLevel(getattr(logging, settings.LOG_LEVEL.upper(), logging.INFO))
+
+    root.addHandler(handler)
+    logging.getLogger(__name__).info("JSON 日志已启用 → %s", json_log_path)