feat(vscode-ide-companion): 添加 Qwen Code CLI 安装检测和提示功能

- 新增 CliDetector 类用于检测 Qwen Code CLI 安装状态
- 在 WebViewProvider 中集成 CLI 检测逻辑
- 添加 CLI 未安装时的提示和安装引导功能
- 优化 agent 连接流程，增加 CLI 安装检测步骤

packages/vscode-ide-companion/src/utils/CliDetector.ts

@@ -0,0 +1,129 @@
+/**
+ * @license
+ * Copyright 2025 Qwen Team
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { exec } from 'child_process';
+import { promisify } from 'util';
+
+const execAsync = promisify(exec);
+
+export interface CliDetectionResult {
+  isInstalled: boolean;
+  cliPath?: string;
+  version?: string;
+  error?: string;
+}
+
+/**
+ * Detects if Qwen Code CLI is installed and accessible
+ */
+export class CliDetector {
+  private static cachedResult: CliDetectionResult | null = null;
+  private static lastCheckTime: number = 0;
+  private static readonly CACHE_DURATION_MS = 30000; // 30 seconds
+
+  /**
+   * Checks if the Qwen Code CLI is installed
+   * @param forceRefresh - Force a new check, ignoring cache
+   * @returns Detection result with installation status and details
+   */
+  static async detectQwenCli(
+    forceRefresh = false,
+  ): Promise<CliDetectionResult> {
+    const now = Date.now();
+
+    // Return cached result if available and not expired
+    if (
+      !forceRefresh &&
+      this.cachedResult &&
+      now - this.lastCheckTime < this.CACHE_DURATION_MS
+    ) {
+      return this.cachedResult;
+    }
+
+    try {
+      const isWindows = process.platform === 'win32';
+      const whichCommand = isWindows ? 'where' : 'which';
+
+      // Check if qwen command exists
+      try {
+        const { stdout } = await execAsync(`${whichCommand} qwen`, {
+          timeout: 5000,
+        });
+        const cliPath = stdout.trim().split('\n')[0];
+
+        // Try to get version
+        let version: string | undefined;
+        try {
+          const { stdout: versionOutput } = await execAsync('qwen --version', {
+            timeout: 5000,
+          });
+          version = versionOutput.trim();
+        } catch {
+          // Version check failed, but CLI is installed
+        }
+
+        this.cachedResult = {
+          isInstalled: true,
+          cliPath,
+          version,
+        };
+        this.lastCheckTime = now;
+        return this.cachedResult;
+      } catch (_error) {
+        // CLI not found
+        this.cachedResult = {
+          isInstalled: false,
+          error: `Qwen Code CLI not found in PATH. Please install it using: npm install -g @qwen-code/qwen-code@latest`,
+        };
+        this.lastCheckTime = now;
+        return this.cachedResult;
+      }
+    } catch (error) {
+      const errorMessage =
+        error instanceof Error ? error.message : String(error);
+      this.cachedResult = {
+        isInstalled: false,
+        error: `Failed to detect Qwen Code CLI: ${errorMessage}`,
+      };
+      this.lastCheckTime = now;
+      return this.cachedResult;
+    }
+  }
+
+  /**
+   * Clears the cached detection result
+   */
+  static clearCache(): void {
+    this.cachedResult = null;
+    this.lastCheckTime = 0;
+  }
+
+  /**
+   * Gets installation instructions based on the platform
+   */
+  static getInstallationInstructions(): {
+    title: string;
+    steps: string[];
+    documentationUrl: string;
+  } {
+    return {
+      title: 'Qwen Code CLI is not installed',
+      steps: [
+        'Install via npm:',
+        '  npm install -g @qwen-code/qwen-code@latest',
+        '',
+        'Or install from source:',
+        '  git clone https://github.com/QwenLM/qwen-code.git',
+        '  cd qwen-code',
+        '  npm install',
+        '  npm install -g .',
+        '',
+        'After installation, reload VS Code or restart the extension.',
+      ],
+      documentationUrl: 'https://github.com/QwenLM/qwen-code#installation',
+    };
+  }
+}