fix: 移除 container 字段和 paths 过滤器，恢复 setup-go/setup-node 以兼容 Gitea Actions

.gitea/workflows/backend-ci.yml

@@ -3,25 +3,26 @@ name: Backend CI
 on:
   push:
     branches: [main]
-    paths: [backend/**]
   pull_request:
     branches: [main]
-    paths: [backend/**]
 
 jobs:
   ci:
     runs-on: aliyun
-    container: golang:1.23-bookworm
-    env:
-      GOPROXY: https://goproxy.cn,direct
     defaults:
       run:
         working-directory: backend
     steps:
       - uses: http://8.161.227.145:3000/huanghaosheng/checkout@releases/v4
 
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.23"
+
       - name: Download dependencies
         run: go mod download
+        env:
+          GOPROXY: https://goproxy.cn,direct
 
       - name: Vet
         run: go vet ./...