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/config.py

@@ -17,6 +17,7 @@ class Settings(BaseSettings):
     # 应用基本信息
     APP_NAME: str = "天工智能体平台"
     APP_VERSION: str = "1.0.0"
+    ENVIRONMENT: str = "dev"  # dev | staging | prod
     DEBUG: bool = False
     SQL_ECHO: bool = False  # 独立于 DEBUG 的 SQL 日志开关，生产环境必须为 False
     SECRET_KEY: str = "dev-secret-key-change-in-production"
@@ -52,6 +53,13 @@ class Settings(BaseSettings):
     AGENT_WORKSPACE_CHAT_LOG_ENABLED: bool = True
     AGENT_WORKSPACE_CHAT_SUBDIR: str = "agent_workspaces"
     
+    # 日志配置
+    LOG_DIR: str = "logs"
+    LOG_LEVEL: str = "INFO"
+    LOG_MAX_BYTES: int = 10 * 1024 * 1024  # 10MB 单文件上限
+    LOG_BACKUP_COUNT: int = 5               # 保留最近5个轮转文件
+    LOG_RETENTION_DAYS: int = 30            # 数据库日志保留天数
+
     # CORS配置（支持字符串或列表）
     CORS_ORIGINS: str = "http://localhost:3000,http://127.0.0.1:3000,http://localhost:8038,http://101.43.95.130:8038"
     
@@ -63,6 +71,11 @@ class Settings(BaseSettings):
     DEEPSEEK_API_KEY: str = ""
     DEEPSEEK_BASE_URL: str = "https://api.deepseek.com"
 
+    # 全局 LLM 降级配置（当 Agent/工作流未配置 fallback_llm 时自动启用）
+    FALLBACK_LLM_MODEL: str = ""
+    FALLBACK_LLM_API_KEY: str = ""
+    FALLBACK_LLM_BASE_URL: str = ""
+
     # SiliconFlow配置（Embedding 推荐使用 SiliconFlow）
     SILICONFLOW_API_KEY: str = ""
     SILICONFLOW_BASE_URL: str = "https://api.siliconflow.cn/v1"
@@ -75,6 +88,7 @@ class Settings(BaseSettings):
     JWT_SECRET_KEY: str = "dev-jwt-secret-key-change-in-production"
     JWT_ALGORITHM: str = "HS256"
     JWT_ACCESS_TOKEN_EXPIRE_MINUTES: int = 30
+    JWT_MOBILE_TOKEN_EXPIRE_MINUTES: int = 10080  # 移动端 7 天，Android EncryptedSharedPreferences 安全存储
 
     # Celery 工作流任务：对**非业务节点失败**（非 WorkflowExecutionError）的退避重试次数，0 表示不重试
     WORKFLOW_TASK_MAX_RETRIES: int = 0
@@ -96,6 +110,11 @@ class Settings(BaseSettings):
     FEISHU_APP_SECRET: str = ""
     FEISHU_VERIFICATION_TOKEN: str = ""
 
+    # 安全加固 — HSTS（生产环境建议启用，开发环境保持关闭）
+    HSTS_ENABLED: bool = False
+    HSTS_MAX_AGE: int = 31536000  # 默认 1 年
+    HSTS_INCLUDE_SUBDOMAINS: bool = True
+
     # Webhook 全局认证 Token — 所有 webhook 触发请求需要携带此 Token
     WEBHOOK_AUTH_TOKEN: str = ""