chore(ci): 移除 Windows pipeline 中的 Git 安装步骤

Git 已在 Windows runner 上手动安装并加入系统 PATH，无需每次 CI 安装。

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

.gitea/workflows/deploy.yml

@@ -53,16 +53,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Install Git (bash)
-        shell: cmd
-        run: |
-          where bash >nul 2>&1 && goto done
-          curl -L -o "%TEMP%\git-setup.exe" https://mirrors.tuna.tsinghua.edu.cn/github-release/git-for-windows/git/LatestRelease/Git-2.49.0-64-bit.exe
-          "%TEMP%\git-setup.exe" /VERYSILENT /NORESTART /NOCANCEL /SP- /CLOSEAPPLICATIONS /RESTARTAPPLICATIONS /COMPONENTS="icons,ext\reg\shellhere,assoc,assoc_sh"
-          :done
-          echo C:\Program Files\Git\bin>> %GITHUB_PATH%
-          echo C:\Program Files\Git\usr\bin>> %GITHUB_PATH%
-
       - name: Compile (Flutter Windows)
         shell: bash
         run: sh scripts/ci/compile-windows.sh "${{ gitea.ref_name }}"