feat:实现Windows系统通知功能

- 集成node-notifier实现跨平台系统通知
   - AI响应完成时自动弹出Windows Toast通知
   - 支持通知防抖机制，避免频繁弹窗
   - 添加通知配置项：启用/禁用、声音、超时时间
   - 移除VS Code内置弹窗，仅在系统通知失败时作为备用

src/utils/messageHandler.ts

@@ -24,6 +24,7 @@ import {
   fetchBalance,
 } from "../services/creditsService";
 import { optimizePrompt } from "../services/promptOptimizeService";
+import { NotificationService } from "../services/notificationService";
 
 import type { RunMode, ServiceTier } from "../types/api";
 
@@ -333,6 +334,17 @@ async function handleUserMessageWithBackend(
               isComplete: true,
             });
             console.log("[MessageHandler] postMessage 返回值:", result);
+
+            // 发送系统通知 - AI 响应完成
+            const notificationService = NotificationService.getInstance();
+            notificationService.success(
+              'IC Coder - AI 响应完成',
+              '您的问题已得到回复，点击查看详情',
+              () => {
+                // 点击通知时聚焦到面板
+                panel.reveal();
+              }
+            );
           } catch (error) {
             console.warn("[MessageHandler] 更新面板失败（面板可能已关闭）:", error);
           }
@@ -845,6 +857,16 @@ export async function handleCreateFile(
       message: " 文件创建成功",
     });
     vscode.window.showInformationMessage(`文件创建成功: ${filePath}`);
+
+    // 发送系统通知
+    const notificationService = NotificationService.getInstance();
+    notificationService.success(
+      'IC Coder - 文件创建',
+      `文件已创建: ${path.basename(filePath)}`,
+      () => {
+        vscode.commands.executeCommand('vscode.open', vscode.Uri.file(filePath));
+      }
+    );
   } catch (error) {
     panel.webview.postMessage({
       command: "fileCreateError",
@@ -872,6 +894,13 @@ export async function handleUpdateFile(
       message: " 文件更新成功",
     });
     vscode.window.showInformationMessage(`文件更新成功: ${filePath}`);
+
+    // 发送系统通知
+    const notificationService = NotificationService.getInstance();
+    notificationService.info(
+      'IC Coder - 文件更新',
+      `文件已更新: ${path.basename(filePath)}`
+    );
   } catch (error) {
     panel.webview.postMessage({
       command: "fileUpdateError",
@@ -1079,6 +1108,17 @@ async function handleVCDGeneration(
         });
 
         vscode.window.showInformationMessage(`VCD 文件生成成功: ${fileName}`);
+
+        // 发送系统通知
+        const notificationService = NotificationService.getInstance();
+        notificationService.success(
+          'IC Coder - 仿真完成',
+          `VCD 文件已生成: ${fileName}`,
+          () => {
+            // 点击通知时打开 VCD 查看器
+            vscode.commands.executeCommand('ic-coder.openVCDViewer', result.vcdFilePath);
+          }
+        );
       } else {
         panel.webview.postMessage({
           command: "receiveMessage",
@@ -1102,6 +1142,17 @@ async function handleVCDGeneration(
       });
 
       vscode.window.showErrorMessage("VCD 文件生成失败");
+
+      // 发送系统通知
+      const notificationService = NotificationService.getInstance();
+      notificationService.error(
+        'IC Coder - 仿真失败',
+        'VCD 文件生成失败，请查看错误信息',
+        () => {
+          // 点击通知时聚焦到面板
+          panel.reveal();
+        }
+      );
     }
   } catch (error) {
     const errorMsg = `❌ 生成 VCD 文件时出错: ${
@@ -1114,6 +1165,16 @@ async function handleVCDGeneration(
     });
 
     vscode.window.showErrorMessage(errorMsg);
+
+    // 发送系统通知
+    const notificationService = NotificationService.getInstance();
+    notificationService.error(
+      'IC Coder - 仿真错误',
+      error instanceof Error ? error.message : '生成 VCD 文件时出错',
+      () => {
+        panel.reveal();
+      }
+    );
   }
 }