chore(release): prepare v1.6.1

[Cmochance]

Version bump 1.6.0 → 1.6.1 + CHANGELOG finalization + bilingual release notes for the v1.6.1 draft release (Windows counterpart of the 1.6.0 macOS ChatGPT-merge adaptation, #54).

# Codex Switch v1.6.1

## 中文

### Windows 端适配 Codex 并入 ChatGPT 桌面 app

1.6.0 修复了 macOS 侧的合并适配,本版补 Windows 端(合并同批于 2026-07-09)。合并后宿主以 `ChatGPT.exe` 运行,MSIX 包家族仍是 `OpenAI.Codex_2p2nqsd0c76g0`,旧的只认 `Codex.exe` 的检测看不到运行界面:切换不退宿主(内存 app-server 仍持旧账号),也不重新拉起。

本版本改动:

- is-running 与 quit 用一次 `Win32_Process` CIM 查询枚举宿主进程名,按每个 PID 的可执行安装身份分类:`OpenAI.Codex*` 包家族(含 beta)或内嵌 `resources\codex.exe` 的非 Store 安装计为本体
- ChatGPT Classic(`OpenAI.ChatGPT-Desktop_…`,可执行名同为 `ChatGPT.exe`)被正向排除,绝不误杀;无法确认身份的宿主计入运行但绝不发信号,切换转为中止而非冒串号风险
- quit 改按 PID 发信号(先 `taskkill /PID` 优雅、后 `/F` 强制),不再按 `/IM 进程名` 全杀
- 启动优先探测到的 Store 包(`shell:AppsFolder` id 不变),否则回退到合格的非 Store `ChatGPT.exe` / `Codex.exe`
- CLI 发现与设置页自动检测新增桌面宿主内嵌 CLI 位置(MSIX `<InstallLocation>\app\resources\codex.exe` 与非 Store `Programs\{ChatGPT,Codex}\resources\codex.exe`)

### 验证

- `cargo test --lib`(137 通过,含新增 Windows 分类/beta/内嵌 CLI 用例)
- `cargo fmt --all -- --check` / `cargo machete`;关键事实取自公开来源(winget / KAPE),尚未在 Windows 实机验证

## English

### Windows adaptation for Codex folding into the ChatGPT desktop app

1.6.0 fixed the macOS side; this release adds Windows (merged for both on 2026-07-09). The merged host runs as `ChatGPT.exe` while the MSIX package family stays `OpenAI.Codex_2p2nqsd0c76g0`, so the old `Codex.exe`-only checks missed the running UI: switching skipped quitting the host (leaving its in-memory app-server on the old account) and never relaunched it.

Changes in this release:

- is-running and quit enumerate host process names via one `Win32_Process` CIM query and classify each PID by its executable install identity: the `OpenAI.Codex*` package family (incl. beta) or a non-Store install embedding `resources\codex.exe` counts as ours
- ChatGPT Classic (`OpenAI.ChatGPT-Desktop_…`, whose executable is also `ChatGPT.exe`) is positively excluded and never killed; an unidentifiable host counts as running but is never signalled, so the switch aborts rather than risk cross-contamination
- quit signals by PID (graceful `taskkill /PID`, then `/F`) instead of `/IM <name>`
- launch prefers the detected Store package (unchanged `shell:AppsFolder` id), falling back to a qualified non-Store `ChatGPT.exe` / `Codex.exe`
- CLI discovery and the Settings auto-detect gain the desktop-bundled CLI locations (MSIX `<InstallLocation>\app\resources\codex.exe` and non-Store `Programs\{ChatGPT,Codex}\resources\codex.exe`)

### Verification

- `cargo test --lib` (137 passed, incl. new Windows classification / beta / bundled-CLI cases)
- `cargo fmt --all -- --check` / `cargo machete`; facts sourced from public manifests (winget / KAPE), not yet verified on a live Windows install

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