fix(windows): re-resolve Codex Desktop path after updates (#2094, #2095)

[dongyu23]

Summary

• Re-resolve the current Codex Desktop installation after Windows Store/AppX updates.
• Support both legacy OpenAI.Codex packages and the newer OpenAI.ChatGPT-Desktop package identity, including neutral_~_publisher MSIX full names.
• Keep explicit --app-path, standalone Windows installs, and existing macOS bundle resolution behavior unchanged.
• Refresh AppX package discovery on every resolution instead of reusing stale process-level package data.

Scope

This PR primarily targets Windows, which is the platform affected by the versioned WindowsApps installation paths reported in #2094 and #2095. macOS behavior is kept compatible and covered by existing regression tests. Codex++ currently does not ship a Linux Desktop target, so Linux Desktop discovery is intentionally outside this PR.

Issues

Closes #2094
Closes #2095

Testing

• F:\\cargo\\bin\\cargo.exe +stable test -p codex-plus-core
• Result: 308 passed, 0 failed.
• Targeted launcher/path tests: 31 passed, 0 failed.

Additional coverage includes old and new AppX package identities, stale saved Store paths after an update, explicit path precedence, Codex++ manager path rejection, portable installs, and macOS bundles.

Notes

The existing unrelated unused import: std::io::Write warning remains unchanged.

[BigPizzaV3]

请先基于当前 main（包含已合并的 #2096）整理分支并重跑 CI。\n\n当前分支仍包含 #2096 的提交 77fc5de，会与已合并改动重复；请 drop 该重复提交后 rebase 到最新 main。\n\n另外请补充/确认 Windows AppX 查询失败、旧 Store 路径仍存在以及新旧宿主并存时的选择行为：自动解析应优先当前注册且版本最高的受支持包，查询失败时才回退已保存路径；显式用户指定的路径应保持原有覆盖语义。完成后请附 Windows 实机或等价测试结果，并重跑三平台 CI。

[BigPizzaV3]

复核：你 force-push 后，分支中仍包含 #2096 的重复提交 77fc5de（经核实 77fc5de 仍是 pr-2097 的祖先）。该 merge 提交 11179a0 已含在最新 main 里，请 drop 这个重复提交并 rebase 到最新 main（当前 07c3659），再重跑三平台 CI，并补齐 Windows AppX 查询失败回退、新旧宿主并存的选择行为测试。处理完我会立即复审。

[BigPizzaV3]

作者已把重复 commit 77fc5de 移除，分支现为干净三提交（f4f9bae9 可合并入当前 main，0 冲突）。解除此前的阻塞。\n\n合并前请确认在最新 main 上通过 Windows artifacts / macOS DMG (arm64) / macOS DMG (x64) 三平台 CI；该修复针对 Windows 更新后 Codex 路径重解析，建议附一个验证 Codex 更新路径场景的用例。