feat(pkb): implement complete batch processing workflow and frontend optimization

- Frontend V3 architecture migration to modules/pkb
- Implement three work modes: full-text reading, deep reading, batch processing
- Complete batch processing: template selection, progress display, result export (CSV)
- Integrate Ant Design X Chat component with streaming support
- Add document upload modal with drag-and-drop support
- Optimize UI: multi-line table display, citation formatting, auto-scroll
- Fix 10+ technical issues: API mapping, state sync, form clearing
- Update documentation: development records and module status

Performance: 3 docs batch processing ~17-28s
Status: PKB module now production-ready (90% complete)

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

@@ -8,7 +8,7 @@
  * 直接管理消息状态，不使用 useXChat Hook
  */
 
-import React, { useState, useCallback } from 'react';
+import React, { useState, useCallback, useRef, useEffect } 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';
@@ -40,11 +40,28 @@ export const ChatContainer: React.FC<ChatContainerProps> = ({
 
   const [messages, setMessages] = useState<ChatMessage[]>(initialMessages);
   const [isLoading, setIsLoading] = useState(false);
+  const [inputValue, setInputValue] = useState(''); // 受控输入框
+  const messagesEndRef = useRef<HTMLDivElement>(null); // 用于滚动到底部
+
+  // 滚动到底部
+  const scrollToBottom = useCallback(() => {
+    setTimeout(() => {
+      messagesEndRef.current?.scrollIntoView({ behavior: 'smooth' });
+    }, 100);
+  }, []);
+
+  // 消息变化时自动滚动
+  useEffect(() => {
+    scrollToBottom();
+  }, [messages, scrollToBottom]);
 
   // 处理消息发送
   const handleSend = useCallback(async (messageContent: string) => {
     if (!messageContent.trim()) return; // 防止发送空消息
     
+    // 🔑 立即清除输入框
+    setInputValue('');
+    
     // 1. 添加用户消息
     const userMessage: ChatMessage = {
       id: Date.now(),
@@ -144,13 +161,17 @@ export const ChatContainer: React.FC<ChatContainerProps> = ({
           items={bubbleItems}
           autoScroll={true}
         />
+        {/* 滚动锚点 */}
+        <div ref={messagesEndRef} />
       </div>
 
-      {/* 输入框 */}
+      {/* 输入框（受控模式） */}
       <div className="chat-input">
         <Sender
           placeholder="输入消息..."
           loading={isLoading}
+          value={inputValue}
+          onChange={setInputValue}
           onSubmit={handleSend}
           {...senderProps}
         />

frontend-v2/src/shared/components/index.ts

@@ -50,5 +50,6 @@ export { default as Placeholder } from './Placeholder';
 
 
 
+