fix(ci): checkout 改用 gitea.* 表达式传参（runner 未注入 GITEA_* 默认环境变量）

.gitea/workflows/miniapp-preview.yml

@@ -16,10 +16,13 @@ jobs:
     steps:
       # 精简 runner（Alpine）无 node，无法跑 action-checkout；直接用 git 浅克隆
       - name: Checkout
+        env:
+          REPO_URL: ${{ gitea.server_url }}/${{ gitea.repository }}
+          REF_NAME: ${{ gitea.ref_name }}
         run: |
           git init -q .
-          git remote add origin "$GITEA_SERVER_URL/$GITEA_REPOSITORY"
+          git remote add origin "$REPO_URL"
-          git fetch -q --depth 20 origin "$GITEA_REF_NAME"
+          git fetch -q --depth 20 origin "$REF_NAME"
           git checkout -q FETCH_HEAD
           git log --oneline -3
 

.gitea/workflows/server-deploy.yml

@@ -13,12 +13,15 @@ jobs:
     # 标准标签：hk / bt-runner 均带 ubuntu-latest，任一空闲 runner 接单
     runs-on: ubuntu-latest
     steps:
-      # hk 等精简 runner（Alpine）无 node，无法跑 action-checkout；直接用 git 浅克隆
+      # 精简 runner（Alpine）无 node，无法跑 action-checkout；直接用 git 浅克隆
       - name: Checkout
+        env:
+          REPO_URL: ${{ gitea.server_url }}/${{ gitea.repository }}
+          REF_NAME: ${{ gitea.ref_name }}
         run: |
           git init -q .
-          git remote add origin "$GITEA_SERVER_URL/$GITEA_REPOSITORY"
+          git remote add origin "$REPO_URL"
-          git fetch -q --depth 20 origin "$GITEA_REF_NAME"
+          git fetch -q --depth 20 origin "$REF_NAME"
           git checkout -q FETCH_HEAD
           git log --oneline -3