feat: 接入聊天历史界面与外链会话恢复

- 新增管理端与用户端聊天历史接口和页面

- 外链聊天支持访问令牌登录、身份保活与当前会话恢复

- 聊天执行链路切到统一 runtime 与 chatlog 查询接口

easyflow-ui-admin/app/src/locales/langs/en-US/bot.json

@@ -17,6 +17,9 @@
   "notConfigured": "NotConfigured",
   "chatPublishBaseUrlMissing": "Publish base URL is not configured. Please set it in system settings first.",
   "chatExternalLink": "Chat External Link",
+  "chatAccessToken": "Access Token",
+  "chatAccessTokenPlaceholder": "Optional. Selected links will include the token",
+  "chatAccessTokenHint": "Only enabled access tokens with public-api chat permission are listed. After selection, copied links and iframe code will automatically include the token.",
   "iframeEmbedCode": "Iframe Embed Code",
   "copyLink": "Copy Link",
   "copyIframeCode": "Copy Code",
@@ -36,6 +39,7 @@
   "publicChatLoading": "Initializing chat environment...",
   "publicChatThinking": "Thinking...",
   "publicChatInitError": "Initialization failed, please try again later",
+  "publicChatTokenInvalid": "The access token is invalid or expired",
   "publicChatAssistantReply": "Assistant Reply",
   "publicChatToolCalling": "Calling tool",
   "publicChatToolDone": "Tool completed",