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/cli/bg/engine.ts

@@ -0,0 +1,49 @@
+/**
+ * BgEngine — cross-platform background session engine abstraction.
+ *
+ * Implementations:
+ *   TmuxEngine    — macOS/Linux with tmux installed
+ *   DetachedEngine — Windows, or macOS/Linux without tmux (fallback)
+ */
+
+export interface SessionEntry {
+  pid: number
+  sessionId: string
+  cwd: string
+  startedAt: number
+  kind: string
+  name?: string
+  logPath?: string
+  entrypoint?: string
+  status?: string
+  waitingFor?: string
+  updatedAt?: number
+  bridgeSessionId?: string
+  agent?: string
+  tmuxSessionName?: string
+  engine?: 'tmux' | 'detached'
+}
+
+export interface BgStartOptions {
+  sessionName: string
+  args: string[]
+  env: Record<string, string | undefined>
+  logPath: string
+  cwd: string
+}
+
+export interface BgStartResult {
+  pid: number
+  sessionName: string
+  logPath: string
+  engineUsed: 'tmux' | 'detached'
+}
+
+export interface BgEngine {
+  readonly name: 'tmux' | 'detached'
+  /** Whether the engine provides a TTY for interactive REPL input. */
+  readonly supportsInteractiveInput: boolean
+  available(): Promise<boolean>
+  start(opts: BgStartOptions): Promise<BgStartResult>
+  attach(session: SessionEntry): Promise<void>
+}