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/api/request.ts

@@ -148,6 +148,7 @@ export const api = createRequestClient(apiURL, {
 export const baseRequestClient = new RequestClient({ baseURL: apiURL });
 
 export interface SseOptions {
+  headers?: HeadersInit;
   onMessage?: (message: ServerSentEventMessage) => void;
   onError?: (err: any) => void;
   onFinished?: () => void;
@@ -186,7 +187,7 @@ export class SseClient {
       const res = await fetch(apiURL + url, {
         method: 'POST',
         signal, // 使用局部变量 signal
-        headers: this.getHeaders(),
+        headers: this.getHeaders(options?.headers),
         body: JSON.stringify(data),
       });
 
@@ -233,13 +234,20 @@ export class SseClient {
     }
   }
 
-  private getHeaders() {
+  private getHeaders(extraHeaders?: HeadersInit) {
     const accessStore = useAccessStore();
-    return {
+    const headers: Record<string, string> = {
       Accept: 'text/event-stream',
       'Content-Type': 'application/json',
       'easyflow-token': accessStore.accessToken || '',
     };
+    if (!extraHeaders) {
+      return headers;
+    }
+    new Headers(extraHeaders).forEach((value, key) => {
+      headers[key] = value;
+    });
+    return headers;
   }
 }