feat: release CI 加入全流程测试门禁

新增独立可复用测试 workflow（test.yml），在 release 构建前串行执行
lint、默认测试、MySQL 测试和 E2E 测试，测试不通过则阻止发布构建。

.github/workflows/test.yml

@@ -0,0 +1,60 @@
+name: Test (Full)
+
+on:
+  workflow_call:
+
+permissions:
+  contents: read
+
+jobs:
+  test-gate:
+    name: Test Gate
+    runs-on: ubuntu-latest
+
+    services:
+      mysql:
+        image: mysql:8.0
+        env:
+          MYSQL_ROOT_PASSWORD: testpass
+          MYSQL_DATABASE: nex_test
+          MYSQL_USER: nex_test
+          MYSQL_PASSWORD: testpass
+        ports:
+          - 13306:3306
+        options: >-
+          --health-cmd="mysqladmin ping -h localhost -u root -ptestpass"
+          --health-interval=3s
+          --health-timeout=5s
+          --health-retries=10
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+        with:
+          lfs: true
+
+      - name: Setup Go
+        uses: actions/setup-go@v6
+        with:
+          go-version-file: go.work
+          cache-dependency-path: |
+            backend/go.sum
+            versionctl/go.sum
+
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v2
+
+      - name: Lint
+        run: make lint
+
+      - name: Test
+        run: make test
+
+      - name: MySQL tests
+        run: cd backend && go test -tags=mysql ./tests/mysql/... -v -count=1
+
+      - name: Install Playwright browsers
+        run: cd frontend && bunx playwright install --with-deps chromium
+
+      - name: E2E tests
+        run: cd frontend && bun run test:e2e