feat: 添加realtime_dialog和realtime_dialog_external_rag_test项目，更新test2项目

test2/server/routes/session.js

@@ -2,6 +2,48 @@ const express = require('express');
 const router = express.Router();
 const db = require('../db');
 
+/**
+ * GET /api/session/list
+ * 获取会话列表（按更新时间倒序，带最后一条消息预览）
+ */
+router.get('/list', async (req, res) => {
+  try {
+    const userId = req.query.userId || null;
+    const limit = parseInt(req.query.limit) || 50;
+    const sessions = await db.getSessionList(userId, limit);
+    res.json({
+      success: true,
+      data: sessions.map((s) => ({
+        id: s.id,
+        userId: s.user_id,
+        mode: s.mode,
+        createdAt: s.created_at,
+        updatedAt: s.updated_at,
+        lastMessage: s.last_message ? (s.last_message.length > 60 ? s.last_message.slice(0, 60) + '...' : s.last_message) : null,
+        messageCount: parseInt(s.message_count) || 0,
+      })),
+    });
+  } catch (err) {
+    console.error('[Session] List failed:', err.message);
+    res.status(500).json({ success: false, error: err.message });
+  }
+});
+
+/**
+ * DELETE /api/session/:id
+ * 删除会话及其所有消息
+ */
+router.delete('/:id', async (req, res) => {
+  try {
+    const { id } = req.params;
+    await db.deleteSession(id);
+    res.json({ success: true });
+  } catch (err) {
+    console.error('[Session] Delete failed:', err.message);
+    res.status(500).json({ success: false, error: err.message });
+  }
+});
+
 /**
  * GET /api/session/:id/history
  * 获取会话完整历史（用于文字↔语音切换时加载上下文）