feat(cli): 添加 CLI 版本检测和会话验证功能

- 新增 CLI 版本检测功能，支持检测 CLI 版本并缓存结果
- 实现会话验证方法，用于检查当前会话是否有效
- 在连接处理中集成 CLI 版本检测和会话验证逻辑
- 优化 WebViewProvider 中的初始化流程，支持背景初始化
- 更新消息处理逻辑，增加与 CLI 相关的错误处理

packages/vscode-ide-companion/src/cli/cliContextManager.ts

@@ -0,0 +1,126 @@
+/**
+ * @license
+ * Copyright 2025 Qwen Team
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import type { CliFeatureFlags, CliVersionInfo } from './cliVersionManager.js';
+
+/**
+ * CLI Context Manager
+ *
+ * Manages the current CLI context including version information and feature availability
+ */
+export class CliContextManager {
+  private static instance: CliContextManager;
+  private currentVersionInfo: CliVersionInfo | null = null;
+
+  private constructor() {}
+
+  /**
+   * Get singleton instance
+   */
+  static getInstance(): CliContextManager {
+    if (!CliContextManager.instance) {
+      CliContextManager.instance = new CliContextManager();
+    }
+    return CliContextManager.instance;
+  }
+
+  /**
+   * Set current CLI version information
+   *
+   * @param versionInfo - CLI version information
+   */
+  setCurrentVersionInfo(versionInfo: CliVersionInfo): void {
+    this.currentVersionInfo = versionInfo;
+  }
+
+  /**
+   * Get current CLI version information
+   *
+   * @returns Current CLI version information or null if not set
+   */
+  getCurrentVersionInfo(): CliVersionInfo | null {
+    return this.currentVersionInfo;
+  }
+
+  /**
+   * Get current CLI feature flags
+   *
+   * @returns Current CLI feature flags or default flags if not set
+   */
+  getCurrentFeatures(): CliFeatureFlags {
+    if (this.currentVersionInfo) {
+      return this.currentVersionInfo.features;
+    }
+
+    // Return default feature flags (all disabled)
+    return {
+      supportsSessionList: false,
+      supportsSessionLoad: false,
+      supportsSessionSave: false,
+    };
+  }
+
+  /**
+   * Check if current CLI supports session/list method
+   *
+   * @returns Whether session/list is supported
+   */
+  supportsSessionList(): boolean {
+    return this.getCurrentFeatures().supportsSessionList;
+  }
+
+  /**
+   * Check if current CLI supports session/load method
+   *
+   * @returns Whether session/load is supported
+   */
+  supportsSessionLoad(): boolean {
+    return this.getCurrentFeatures().supportsSessionLoad;
+  }
+
+  /**
+   * Check if current CLI supports session/save method
+   *
+   * @returns Whether session/save is supported
+   */
+  supportsSessionSave(): boolean {
+    return this.getCurrentFeatures().supportsSessionSave;
+  }
+
+  /**
+   * Check if CLI is installed and detected
+   *
+   * @returns Whether CLI is installed
+   */
+  isCliInstalled(): boolean {
+    return this.currentVersionInfo?.detectionResult.isInstalled ?? false;
+  }
+
+  /**
+   * Get CLI version string
+   *
+   * @returns CLI version string or undefined if not detected
+   */
+  getCliVersion(): string | undefined {
+    return this.currentVersionInfo?.version;
+  }
+
+  /**
+   * Check if CLI version is supported
+   *
+   * @returns Whether CLI version is supported
+   */
+  isCliVersionSupported(): boolean {
+    return this.currentVersionInfo?.isSupported ?? false;
+  }
+
+  /**
+   * Clear current CLI context
+   */
+  clearContext(): void {
+    this.currentVersionInfo = null;
+  }
+}