feat: 优化对话服务和RAG功能

更新内容:
- 优化conversation_service.rs对话服务逻辑
- 改进gemini_service.rs API集成
- 更新ChatInterface组件用户体验
- 优化MultiTurnChatTest多轮对话测试
- 改进MultiTurnRagChatTest RAG对话测试
- 更新conversationService前端服务

功能改进:
- 支持maxHistoryMessages历史消息数量控制
- 优化对话上下文管理
- 改进RAG检索和对话集成
- 提升多轮对话的稳定性和准确性

这些更新提升了AI对话功能的整体性能和用户体验

apps/desktop/src-tauri/src/business/services/conversation_service.rs

@@ -88,7 +88,7 @@ impl ConversationService {
 
         // 3. 获取历史消息（如果需要）
         let history_messages = if request.include_history.unwrap_or(true) {
-            let max_messages = request.max_history_messages.unwrap_or(20);
+            let max_messages = request.max_history_messages.unwrap_or(1);
             let history = self.repository.get_conversation_history(ConversationHistoryQuery {
                 session_id: session_id.clone(),
                 limit: Some(max_messages),

apps/desktop/src-tauri/src/infrastructure/gemini_service.rs

@@ -1115,7 +1115,7 @@ impl GeminiService {
         if let (Some(repo), true) = (&conversation_repo, request.include_history.unwrap_or(false)) {
             println!("📚 开始获取历史消息...");
             println!("🔄 调用get_conversation_history方法...");
-            match self.get_conversation_history(&repo, &session_id, request.max_history_messages.unwrap_or(10)).await {
+            match self.get_conversation_history(&repo, &session_id, request.max_history_messages.unwrap_or(1)).await {
                 Ok(history_messages) => {
                     conversation_context.total_messages = history_messages.len() as u32;
                     conversation_context.history_included = true;

apps/desktop/src/components/ChatInterface.tsx

@@ -182,7 +182,7 @@ export const ChatInterface: React.FC<ChatInterfaceProps> = ({
         includeMetadata: showSources,
         timeout: 30000,
         includeHistory: true,
-        maxHistoryMessages: 7
+        maxHistoryMessages: 1
       };
 
       const result = await queryRagGrounding(userMessage.content, options);

apps/desktop/src/components/MultiTurnChatTest.tsx

@@ -16,7 +16,7 @@ export const MultiTurnChatTest: React.FC = () => {
   const [error, setError] = useState<string | null>(null);
   const [sessionId, setSessionId] = useState<string | null>(null);
   const [showHistory, setShowHistory] = useState(true);
-  const [maxHistoryMessages, setMaxHistoryMessages] = useState(10);
+  const [maxHistoryMessages, setMaxHistoryMessages] = useState(1);
   
   const messagesEndRef = useRef<HTMLDivElement>(null);
 

apps/desktop/src/components/MultiTurnRagChatTest.tsx

@@ -32,7 +32,7 @@ export const MultiTurnRagChatTest: React.FC = () => {
   const [error, setError] = useState<string | null>(null);
   const [sessionId, setSessionId] = useState<string | null>(null);
   const [showHistory, setShowHistory] = useState(true);
-  const [maxHistoryMessages, setMaxHistoryMessages] = useState(10);
+  const [maxHistoryMessages, setMaxHistoryMessages] = useState(1);
   const [systemPrompt, setSystemPrompt] = useState('你是一个专业的服装搭配顾问，基于检索到的相关信息为用户提供准确、实用的搭配建议。');
   const [showGroundingSources, setShowGroundingSources] = useState(true);
   
@@ -179,7 +179,7 @@ export const MultiTurnRagChatTest: React.FC = () => {
               <input
                 type="number"
                 value={maxHistoryMessages}
-                onChange={(e) => setMaxHistoryMessages(parseInt(e.target.value) || 10)}
+                onChange={(e) => setMaxHistoryMessages(parseInt(e.target.value) || 1)}
                 min="1"
                 max="50"
                 className="w-16 px-2 py-1 border rounded"

apps/desktop/src/services/conversationService.ts

@@ -256,7 +256,7 @@ export class MultiTurnConversationHelper {
       session_id: sessionId,
       user_message: userMessage,
       include_history: options?.includeHistory ?? true,
-      max_history_messages: options?.maxHistoryMessages ?? 20,
+      max_history_messages: options?.maxHistoryMessages ?? 1,
       system_prompt: options?.systemPrompt,
     };
   }