fix(git): preserve env-backed simple-git behavior (re-submit of #323)

[MocA-Love]

#323 を revert (#329) したため、同内容の PR を再作成したもの。レビューのやり直しを前提としており、問題なければ改めてマージする想定。

内容

シェル環境に `PAGER=less` など simple-git 3.36+ の block-unsafe-operations プラグインが弾く env が設定されていると、以下のエラーで desktop アプリ内の worktree / workspace 操作が失敗する:

```
Use of "PAGER" is not permitted without enabling allowUnsafePager
```

採用アプローチ

env を strip するのではなく、env に存在する unsafe キーに対応する `allowUnsafe` フラグだけを simple-git に渡す* 方式。

• `packages/shared/src/simple-git-unsafe.ts` に `buildSimpleGitUnsafeOptions(env)` helper を追加
• `apps/desktop` と `packages/host-service` 両方の simple-git 呼び出しを helper 経由に統一
• `GIT_SSH_COMMAND` 等のカスタム SSH 設定は env として保持されるため、SSH 経由 fetch/ls-remote が壊れない

差分

元 #323 と同じ 2 コミット (b8d0c97 + ab78b34) を cherry-pick:

• `fix(desktop): simple-git 3.36+ の PAGER env ブロックを回避`
• `fix(git): preserve env-backed simple-git behavior` (Codex レビュー P1 指摘 `GIT_SSH*` 保持対応)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: ed8e8127-a536-472c-8dff-acbfe1aeca4f

📥 Commits

Reviewing files that changed from the base of the PR and between 3257efc and 01dc63b.

📒 Files selected for processing (9)

• apps/desktop/src/lib/trpc/routers/projects/projects.ts
• apps/desktop/src/lib/trpc/routers/workspaces/utils/git-client.ts
• packages/host-service/src/runtime/git/git.ts
• packages/host-service/src/runtime/git/simple-git.ts
• packages/host-service/src/trpc/router/project/project.ts
• packages/host-service/src/trpc/router/workspace-creation/workspace-creation.ts
• packages/host-service/src/trpc/router/workspace/workspace.ts
• packages/shared/package.json
• packages/shared/src/simple-git-unsafe.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/simple-git-pager-env-v2

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