feat: 添加MinIO文件系统支持并优化外部连接器功能

- 添加MinIO用户文件系统配置选项(BEAVER_MINIO_ROOT_USER等)
- 更新外部连接器配置结构，包括BASE_URL和认证令牌设置
- 改进connector provider支持更多类型(official, feishu_bot等)
- 实现Mistral模型推理模式支持reasoning_effort参数
- 增强外部连接器策略配置和运行时配置管理
- 添加connector bridge事件验证和安全保护机制
- 优化任务路由逻辑，区分simple_chat和new_task场景
- 更新初始技能工具提示配置，分离authoring admin功能

.env.example

@@ -26,17 +26,27 @@ BEAVER_AUTHZ_URL=http://beaver-authz-service:19090
 BEAVER_OUTLOOK_MCP_URL=
 BEAVER_OUTLOOK_MCP_SERVER_ID=outlook_mcp
 
+# User file system backed by MinIO/S3.
+BEAVER_MINIO_ROOT_USER=
+BEAVER_MINIO_ROOT_PASSWORD=
+BEAVER_USER_FILES_BUCKET=beaver-user-files
+BEAVER_USER_FILES_MINIO_ENDPOINT=
+BEAVER_USER_FILES_MAX_UPLOAD_BYTES=5368709120
+
 # Must be reachable from auth-portal and authz-service containers.
 BEAVER_DEPLOY_URL=http://beaver-deploy-control:8090
 
 # External connector sidecar
-EXTERNAL_CONNECTOR_TOKEN=
-BEAVER_BRIDGE_TOKEN=
+EXTERNAL_CONNECTOR_BASE_URL=http://external-connector:8787
+# Required for connector management API authentication.
+EXTERNAL_CONNECTOR_TOKEN=change-me-connector-token
+# Required for sidecar -> Beaver bridge authentication.
+BEAVER_BRIDGE_TOKEN=change-me-bridge-token
 BEAVER_BRIDGE_BASE_URL=http://app-instance:8080
 EXTERNAL_CONNECTOR_PORT=8787
 CONNECTOR_PUBLIC_BASE_URL=http://localhost:8787
-# fake | vendor_cli | weixin_ilink
-CONNECTOR_PROVIDER=vendor_cli
+# fake | official | vendor_cli | weixin_ilink | feishu_bot
+CONNECTOR_PROVIDER=official
 CONNECTOR_COMMAND_TIMEOUT_SECONDS=120
 WEIXIN_CONNECT_COMMAND=
 WEIXIN_STATUS_COMMAND=