feat: RAG回复显示知识库来源，含文件名和相似度分数

js/components/chat-area.js

@@ -193,6 +193,21 @@ export function appendMessageDOM(msg, index) {
         contentHtml += `<div class="msg-stats">${stats.map(s => `<span>${s}</span>`).join(' · ')}</div>`;
     }
 
+    // RAG 知识库来源
+    if (msg.role === 'assistant' && msg.ragSources && msg.ragSources.length > 0) {
+        const sourcesHtml = msg.ragSources.map((s, i) => {
+            const scorePercent = s.score ? `${(s.score * 100).toFixed(0)}%` : '';
+            return `<div class="rag-source-item">
+                <span class="rag-source-name">📄 来源 ${i + 1}: ${escapeHtml(s.filename)}</span>
+                ${scorePercent ? `<span class="rag-source-score">${scorePercent}</span>` : ''}
+            </div>`;
+        }).join('');
+        contentHtml += `<div class="rag-sources">
+            <div class="rag-sources-header">🧠 基于知识库回答</div>
+            ${sourcesHtml}
+        </div>`;
+    }
+
     div.innerHTML = `
         <div class="msg-avatar">${avatar}</div>
         <div class="msg-body">

js/components/input-area.js

@@ -402,12 +402,19 @@ export async function sendMessage() {
         };
 
         // RAG 检索增强
+        let ragSources = null;
         if (isRagEnabled()) {
             const ragResult = await performRagRetrieval(text);
             if (ragResult && ragResult.ragPrompt) {
                 chatParams.system = chatParams.system
                     ? chatParams.system + '\n\n' + ragResult.ragPrompt
                     : ragResult.ragPrompt;
+                // 保存检索来源信息
+                ragSources = ragResult.results.map(r => ({
+                    filename: r.filename,
+                    score: r.score,
+                    text: truncate(r.text, 100)
+                }));
             }
         }
 
@@ -434,7 +441,8 @@ export async function sendMessage() {
             timestamp: Date.now(),
             ...(modelName && { model: modelName }),
             ...(thinkContent && { think: thinkContent }),
-            ...(finalStats && { eval_count: finalStats.eval_count, total_duration: finalStats.total_duration })
+            ...(finalStats && { eval_count: finalStats.eval_count, total_duration: finalStats.total_duration }),
+            ...(ragSources && { ragSources })
         };
         currentSession.messages.push(assistantMsg);