feat(deploy): 新增 Windows 桌面客户端构建与发布支持

CI 拆成三个 job（mac 构建 Linux/Web、windows 构建 Windows 桌面、mac 发布部署）；新增 compile-windows.sh 用 Flutter 构建并打包为 jiu-windows-x64.zip；release.sh 自动写入 Windows 下载 URL 到 version.yaml 并上传 zip。下载页 Windows 卡片从"敬请期待"改为真实下载按钮，URL 由 API 动态填充。

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

.gitea/workflows/deploy.yml

@@ -6,7 +6,7 @@ on:
       - 'v[0-9]*.[0-9]*.[0-9]*'
 
 jobs:
-  deploy:
+  build-linux-web:
     runs-on: mac
     env:
       GOPROXY: https://goproxy.cn,direct
@@ -16,9 +16,58 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Compile
+      - name: Compile (Linux backend + Flutter Web)
         run: sh scripts/ci/compile.sh "${{ gitea.ref_name }}"
 
+      - name: Upload linux-web artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: linux-web
+          path: dist/
+
+  build-windows:
+    runs-on: windows
+    env:
+      GOPROXY: https://goproxy.cn,direct
+      PUB_HOSTED_URL: https://pub.flutter-io.cn
+      FLUTTER_STORAGE_BASE_URL: https://storage.flutter-io.cn
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Compile (Flutter Windows)
+        shell: bash
+        run: sh scripts/ci/compile-windows.sh "${{ gitea.ref_name }}"
+
+      - name: Upload windows artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: windows
+          path: dist/
+
+  release-deploy:
+    needs: [build-linux-web, build-windows]
+    runs-on: mac
+    env:
+      GOPROXY: https://goproxy.cn,direct
+      PUB_HOSTED_URL: https://pub.flutter-io.cn
+      FLUTTER_STORAGE_BASE_URL: https://storage.flutter-io.cn
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Download linux-web artifacts
+        uses: actions/download-artifact@v3
+        with:
+          name: linux-web
+          path: dist/
+
+      - name: Download windows artifacts
+        uses: actions/download-artifact@v3
+        with:
+          name: windows
+          path: dist/
+
       - name: Test
         run: sh scripts/ci/test.sh