feat: 添加一键优化提示词功能

- 在 ICHelperPanel.ts 添加 optimizePrompt 消息处理分支
- 新增 promptOptimizeService.ts 调用后端优化 API
- 完善 WebView 端优化按钮交互逻辑

src/utils/messageHandler.ts

@@ -22,6 +22,7 @@ import {
   checkBalanceBeforeSend,
   fetchBalance,
 } from "../services/creditsService";
+import { optimizePrompt } from "../services/promptOptimizeService";
 
 import type { RunMode, ServiceTier } from "../types/api";
 
@@ -1031,3 +1032,35 @@ async function handleVCDGeneration(
     vscode.window.showErrorMessage(errorMsg);
   }
 }
+
+/**
+ * 处理提示词优化请求
+ */
+export async function handleOptimizePrompt(
+  panel: vscode.WebviewPanel,
+  prompt: string
+): Promise<void> {
+  console.log("[MessageHandler] ========== 收到提示词优化请求 ==========");
+  console.log("[MessageHandler] prompt:", prompt);
+  console.log("[MessageHandler] prompt 长度:", prompt?.length);
+
+  try {
+    console.log("[MessageHandler] 开始调用 optimizePrompt...");
+    const optimized = await optimizePrompt(prompt);
+    console.log("[MessageHandler] 优化成功，结果:", optimized);
+    panel.webview.postMessage({
+      command: "optimizeResult",
+      success: true,
+      optimizedPrompt: optimized,
+    });
+  } catch (error) {
+    const errorMsg = error instanceof Error ? error.message : "优化失败";
+    console.error("[MessageHandler] 提示词优化失败:", errorMsg);
+    panel.webview.postMessage({
+      command: "optimizeResult",
+      success: false,
+      error: errorMsg,
+    });
+    vscode.window.showErrorMessage(`提示词优化失败: ${errorMsg}`);
+  }
+}