Feat/integrate lint preview (#285)

* feat: 适配 zed acp 协议

* docs: 完善 acp 文档

* feat: integrate feature branches + daemon/job 命令层级化 + 跨平台后台引擎

Cherry-picked from origin/lint/preview (637c908), excluding lint-only changes.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: correct detectMimeFromBase64 to decode raw bytes from base64

Cherry-picked from origin/lint/preview (ee36954).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: daemon 子进程 spawn 跨平台修复 + CliLaunchSpec 集中化重构

Cherry-picked from origin/lint/preview (c5f52cd), excluding lint-only formatting changes.

- 新建 src/utils/cliLaunch.ts: 集中化 CLI 子进程启动层
- 修复 --daemon-worker=kind 等号格式解析
- 修复 daemon/bg fast path 缺少 setShellIfWindows()
- 修复 checkPathExists 用 existsSync 替代 execSync('dir')
- 7 个 spawn 站点迁移到 CliLaunchSpec

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: merge tsconfig.base.json into tsconfig.json with full compiler options

The cherry-pick from 637c908 dropped jsx/strict/etc settings when removing
tsconfig.base.json. This commit restores them in a single tsconfig.json.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: merge tsconfig.base.json into tsconfig.json with full compiler options

The cherry-pick from 637c908 dropped jsx/strict/etc settings when removing
tsconfig.base.json. This commit restores them in a single tsconfig.json.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

src/utils/config.ts

@@ -334,6 +334,9 @@ export type GlobalConfig = {
   overageCreditUpsellSeenCount?: number // Number of times the overage credit upsell has been shown
   hasVisitedExtraUsage?: boolean // Whether the user has visited /extra-usage — hides credit upsells
 
+  // Display language preference
+  preferredLanguage?: 'auto' | 'en' | 'zh' // auto = follow system locale, en = English, zh = 中文
+
   // Voice mode notice tracking
   voiceNoticeSeenCount?: number // Number of times the voice-mode-available notice has been shown
   voiceLangHintShownCount?: number // Number of times the /voice dictation-language hint has been shown
@@ -556,7 +559,6 @@ export type GlobalConfig = {
   // Speculation configuration (ant-only)
   speculationEnabled?: boolean // Whether speculation is enabled (default: true)
 
-
   // Client data for server-side experiments (fetched during bootstrap).
   clientDataCache?: Record<string, unknown> | null