feat: 全新智能体功能

- 基于先进智能体框架，增加智能体编排功能
- 增加智能体聊天，并对接持久化

easyflow-ui-usercenter/packages/utils/src/helpers/chat-time.ts

@@ -10,7 +10,7 @@ import type {
   ChatTimeToolStatus,
 } from '../../../types/src/chat-time';
 
-import { uuid } from './uuid';
+import {uuid} from './uuid';
 
 type ChatTimeToolMeta = {
   arguments?: string;
@@ -159,6 +159,35 @@ class ChatTimeTimelineBuilder {
     assistant.typing = true;
   }
 
+  /**
+   * 用最终完整回答替换当前 assistant 文本。
+   */
+  static replaceMessageContent(
+    items: ChatTimeTimelineItem[],
+    content?: string,
+    created?: number | string,
+    meta?: ChatTimeRoundMeta,
+  ) {
+    const normalizedContent = normalizeAssistantText(content);
+    if (!normalizedContent) {
+      return;
+    }
+    prepareRoundVariant(items, meta);
+    const assistant = ensureAssistantTail(items, created, meta);
+    stopThinkingForAssistant(assistant);
+    assistant.content = normalizedContent;
+    assistant.segments = [
+      ...assistant.segments.filter((segment) => segment.type !== 'text'),
+      {
+        content: normalizedContent,
+        id: uuid(),
+        type: 'text' as const,
+      },
+    ];
+    assistant.loading = false;
+    assistant.typing = false;
+  }
+
   /**
    * 停止当前 assistant 的思考态。
    */
@@ -1003,9 +1032,7 @@ function normalizePositiveInteger(value: any) {
 }
 
 function normalizeAssistantText(value: any) {
-  return normalizePlainText(value)
-    .replace(/^Final Answer:\s*/i, '')
-    .replaceAll('```echartsoption', '```echarts\noption');
+  return normalizePlainText(value);
 }
 
 function normalizePayloadValue(value: any) {