feat: add selectable forwarding modes and optional preview deployment

默认使用可信同源路径转发，支持界面切换隔离预览并按需部署。

.github/workflows/deploy-preview.yml

@@ -0,0 +1,14 @@
+name: 部署预览 Worker
+
+on:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  deploy:
+    uses: ./.github/workflows/deploy.yml
+    with:
+      deploy_preview: true
+    secrets: inherit

.github/workflows/deploy.yml

@@ -20,6 +20,11 @@ on:
         description: 需要检出并部署的提交 SHA
         required: false
         type: string
+      deploy_preview:
+        description: 是否同时部署预览 Worker
+        required: false
+        default: false
+        type: boolean
 
 concurrency:
   group: production-deploy
@@ -49,6 +54,7 @@ jobs:
       # 域名本身不是敏感信息，推荐使用 Variable；同时兼容已将它保存为 Secret 的仓库。
       CUSTOM_DOMAIN: ${{ secrets.CUSTOM_DOMAIN || vars.CUSTOM_DOMAIN }}
       PREVIEW_DOMAIN: ${{ vars.PREVIEW_DOMAIN }}
+      DEPLOY_PREVIEW_WORKER: ${{ inputs.deploy_preview && 'true' || 'false' }}
     steps:
       - name: Check out repository
         uses: actions/checkout@v4