feat(dc): Complete Tool C Day 5 - AI Chat + Ant Design X Integration

Summary:
- Upgrade to Ant Design 6.0.1 + install Ant Design X (2.1.0) + X SDK (2.1.0)
- Develop frontend common capability layer: Chat component library (~968 lines)
  * ChatContainer.tsx - Core container component
  * MessageRenderer.tsx - Message renderer
  * CodeBlockRenderer.tsx - Code block renderer with syntax highlighting
  * Complete TypeScript types and documentation
- Integrate ChatContainer into Tool C
- Fix 7 critical UI issues:
  * AG Grid module registration error
  * UI refinement (borders, shadows, gradients)
  * Add AI welcome message
  * Auto-clear input field after sending
  * Remove page scrollbars
  * Manual code execution (not auto-run)
  * Support simple Q&A (new /ai/chat API)
- Complete end-to-end testing
- Update all documentation (4 status docs + 6 dev logs)

Technical Stack:
- Frontend: React 19 + Ant Design 6.0 + Ant Design X 2.1
- Components: Bubble, Sender from @ant-design/x
- Total code: ~5418 lines

Status: Tool C MVP completed, production ready

frontend-v2/src/shared/components/Chat/ChatContainer.tsx

@@ -0,0 +1,162 @@
+/**
+ * ChatContainer - 通用 AI 对话容器组件
+ * 
+ * 基于 Ant Design X + X SDK 构建
+ * 支持多场景：AIA、PKB、Tool C
+ * 
+ * 注意：由于 Ant Design X SDK 的复杂性，这里采用简化实现
+ * 直接管理消息状态，不使用 useXChat Hook
+ */
+
+import React, { useState, useCallback } from 'react';
+import { Bubble, Sender } from '@ant-design/x';
+import type { ChatContainerProps, ChatMessage } from './types';
+import type { BubbleItemType } from '@ant-design/x/es/bubble/interface';
+import './styles/chat.css';
+
+/**
+ * ChatContainer 组件（简化实现）
+ */
+export const ChatContainer: React.FC<ChatContainerProps> = ({
+  conversationKey: _conversationKey,
+  defaultMessages = [],
+  providerConfig,
+  customMessageRenderer,
+  senderProps = {},
+  onMessageSent,
+  onMessageReceived,
+  onError,
+  className = '',
+  style = {},
+}) => {
+  // 如果没有默认消息，添加欢迎语
+  const initialMessages = defaultMessages.length > 0 ? defaultMessages : [{
+    id: 'welcome',
+    role: 'assistant' as const,
+    content: '您好！我是您的 AI 数据分析师。我可以帮您编写代码来清洗数据。试试说："把年龄大于60的设为老年组"。',
+    status: 'success' as const,
+    timestamp: Date.now(),
+  }];
+
+  const [messages, setMessages] = useState<ChatMessage[]>(initialMessages);
+  const [isLoading, setIsLoading] = useState(false);
+
+  // 处理消息发送
+  const handleSend = useCallback(async (messageContent: string) => {
+    if (!messageContent.trim()) return; // 防止发送空消息
+    
+    // 1. 添加用户消息
+    const userMessage: ChatMessage = {
+      id: Date.now(),
+      role: 'user',
+      content: messageContent,
+      status: 'success',
+      timestamp: Date.now(),
+    };
+
+    setMessages(prev => [...prev, userMessage]);
+    
+    if (onMessageSent) {
+      onMessageSent(userMessage);
+    }
+
+    // 2. 显示加载状态
+    const loadingMessage: ChatMessage = {
+      id: 'loading',
+      role: 'assistant',
+      content: '正在思考...',
+      status: 'loading',
+      timestamp: Date.now(),
+    };
+    
+    setMessages(prev => [...prev, loadingMessage]);
+    setIsLoading(true);
+
+    try {
+      // 3. 调用后端 API
+      let response;
+      if (providerConfig.requestFn) {
+        response = await providerConfig.requestFn(messageContent, { messages });
+      } else {
+        const res = await fetch(providerConfig.apiEndpoint, {
+          method: 'POST',
+          headers: { 'Content-Type': 'application/json' },
+          body: JSON.stringify({ message: messageContent }),
+        });
+        
+        if (!res.ok) throw new Error('API 请求失败');
+        response = await res.json();
+      }
+
+      // 4. 移除加载消息，添加 AI 响应
+      const aiMessage: ChatMessage = {
+        id: response.messageId || Date.now(),
+        role: 'assistant',
+        content: response.explanation || response.message || response.content || '',
+        status: 'success',
+        code: response.code,
+        explanation: response.explanation,
+        timestamp: Date.now(),
+        metadata: response.metadata,
+      };
+
+      setMessages(prev => prev.filter(m => m.id !== 'loading').concat(aiMessage));
+
+      if (onMessageReceived) {
+        onMessageReceived(aiMessage);
+      }
+
+    } catch (error: any) {
+      // 5. 错误处理
+      const errorMessage: ChatMessage = {
+        id: Date.now(),
+        role: 'assistant',
+        content: `抱歉，处理您的请求时出现错误：${error.message}`,
+        status: 'error',
+        timestamp: Date.now(),
+      };
+
+      setMessages(prev => prev.filter(m => m.id !== 'loading').concat(errorMessage));
+
+      if (onError) {
+        onError(error);
+      }
+    } finally {
+      setIsLoading(false);
+    }
+  }, [messages, providerConfig, onMessageSent, onMessageReceived, onError]);
+
+  // 转换消息为 Bubble.List 所需格式
+  const bubbleItems: BubbleItemType[] = messages.map((msg) => ({
+    key: msg.id,
+    role: msg.role,
+    content: customMessageRenderer 
+      ? customMessageRenderer({ id: msg.id, message: msg, status: msg.status || 'success' })
+      : msg.content,
+    status: msg.status,
+  }));
+
+  return (
+    <div className={`chat-container ${className}`} style={style}>
+      {/* 消息列表 */}
+      <div className="chat-messages">
+        <Bubble.List
+          items={bubbleItems}
+          autoScroll={true}
+        />
+      </div>
+
+      {/* 输入框 */}
+      <div className="chat-input">
+        <Sender
+          placeholder="输入消息..."
+          loading={isLoading}
+          onSubmit={handleSend}
+          {...senderProps}
+        />
+      </div>
+    </div>
+  );
+};
+
+export default ChatContainer;