feat(mcp): add Rust module and Tauri commands for Claude MCP

- Manage ~/.claude/settings.local.json and ~/.claude/mcp.json
- Atomic JSON read/write with preservation of unknown fields
- Commands: get_claude_mcp_status, read_claude_mcp_config, set_claude_mcp_enable_all_projects, upsert_claude_mcp_server, delete_claude_mcp_server, validate_mcp_command
- Register commands in Tauri invoke handler
- PATH-based command availability check (non-executing)

src-tauri/src/commands.rs

@@ -7,6 +7,7 @@ use tauri_plugin_opener::OpenerExt;
 
 use crate::app_config::AppType;
 use crate::claude_plugin;
+use crate::claude_mcp;
 use crate::codex_config;
 use crate::config::{self, get_claude_settings_path, ConfigStatus};
 use crate::provider::{Provider, ProviderMeta};
@@ -659,6 +660,46 @@ pub async fn open_app_config_folder(handle: tauri::AppHandle) -> Result<bool, St
     Ok(true)
 }
 
+// =====================
+// Claude MCP 管理命令
+// =====================
+
+/// 获取 Claude MCP 状态（settings.local.json 与 mcp.json）
+#[tauri::command]
+pub async fn get_claude_mcp_status() -> Result<crate::claude_mcp::McpStatus, String> {
+    claude_mcp::get_mcp_status()
+}
+
+/// 读取 mcp.json 文本内容（不存在则返回 Ok(None)）
+#[tauri::command]
+pub async fn read_claude_mcp_config() -> Result<Option<String>, String> {
+    claude_mcp::read_mcp_json()
+}
+
+/// 设置 enableAllProjectMcpServers 开关
+#[tauri::command]
+pub async fn set_claude_mcp_enable_all_projects(enable: bool) -> Result<bool, String> {
+    claude_mcp::set_enable_all_projects(enable)
+}
+
+/// 新增或更新一个 MCP 服务器条目
+#[tauri::command]
+pub async fn upsert_claude_mcp_server(id: String, spec: serde_json::Value) -> Result<bool, String> {
+    claude_mcp::upsert_mcp_server(&id, spec)
+}
+
+/// 删除一个 MCP 服务器条目
+#[tauri::command]
+pub async fn delete_claude_mcp_server(id: String) -> Result<bool, String> {
+    claude_mcp::delete_mcp_server(&id)
+}
+
+/// 校验命令是否在 PATH 中可用（不执行）
+#[tauri::command]
+pub async fn validate_mcp_command(cmd: String) -> Result<bool, String> {
+    claude_mcp::validate_command_in_path(&cmd)
+}
+
 /// 获取设置
 #[tauri::command]
 pub async fn get_settings() -> Result<crate::settings::AppSettings, String> {