fix(ci): 精简 runner 环境自适应安装 curl（发布 release 依赖）

.gitea/workflows/server-deploy.yml

@@ -25,6 +25,17 @@ jobs:
           git checkout -q FETCH_HEAD
           git log --oneline -3
 
+      - name: Ensure curl available
+        run: |
+          # 精简 runner（Alpine 等）可能未预装 curl，发布 release 需要它
+          if ! command -v curl >/dev/null 2>&1; then
+            if command -v apk >/dev/null 2>&1; then apk add --no-cache curl
+            elif command -v apt-get >/dev/null 2>&1; then apt-get update -qq && apt-get install -y -qq curl
+            elif command -v dnf >/dev/null 2>&1; then dnf install -y -q curl
+            else echo "无法安装 curl"; exit 1; fi
+          fi
+          curl --version | head -1
+
       - name: Prepare Go toolchain
         run: |
           # 优先复用 runner 宿主机缓存的工具链（工作目录持久化）