refactor(types): rename AppType to AppId for semantic clarity

Rename `AppType` to `AppId` across the entire frontend codebase to better
reflect its purpose as an application identifier rather than a type category.
This aligns frontend naming with backend command parameter conventions.

Changes:
- Rename type `AppType` to `AppId` in src/lib/api/types.ts
- Remove `AppType` export from src/lib/api/index.ts
- Update all component props from `appType` to `appId` (43 files)
- Update all variable names from `appType` to `appId`
- Synchronize documentation (CHANGELOG, refactoring plans)
- Update test files and MSW mocks

BREAKING CHANGE: `AppType` type is no longer exported. Use `AppId` instead.
All component props have been renamed from `appType` to `appId`.

CHANGELOG.md

@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [3.5.0] - 2025-01-15
 
+### ⚠ Breaking Changes
+
+- Tauri 命令仅接受参数 `app`（取值：`claude`/`codex`）；移除对 `app_type`/`appType` 的兼容。
+- 前端类型命名统一为 `AppId`（移除 `AppType` 导出），变量命名统一为 `appId`。
+
 ### ✨ New Features
 
 - **MCP (Model Context Protocol) Management** - Complete MCP server configuration management system