feat: 新增开发 CI 流程，重构 test.yml 支持分层测试

新增 ci.yml，在 push（dev/main）和 PR 时触发快速检查（lint + 全量测试）
重构 test.yml，新增 full 参数控制是否运行 MySQL 和 E2E 测试
release.yml 调用 test.yml 时传 full: true，行为与重构前一致
同步更新 ci-test-gate spec

.github/workflows/ci.yml

@@ -0,0 +1,14 @@
+name: CI
+
+on:
+  push:
+    branches: [dev, main]
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  check:
+    name: Check
+    uses: ./.github/workflows/test.yml

.github/workflows/release.yml

@@ -41,6 +41,8 @@ jobs:
     name: Test Gate
     needs: prepare
     uses: ./.github/workflows/test.yml
+    with:
+      full: true
 
   build-web:
     name: Build Web Asset

.github/workflows/test.yml

@@ -2,13 +2,48 @@ name: Test (Full)
 
 on:
   workflow_call:
+    inputs:
+      full:
+        description: "Run full test suite including MySQL and E2E"
+        required: false
+        default: false
+        type: boolean
 
 permissions:
   contents: read
 
 jobs:
-  test-gate:
-    name: Test Gate
+  check:
+    name: Check
+    runs-on: ubuntu-latest
+
+    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
+
+  mysql:
+    name: MySQL Tests
+    if: inputs.full
+    needs: check
     runs-on: ubuntu-latest
 
     services:
@@ -41,18 +76,32 @@ jobs:
             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
 
+  e2e:
+    name: E2E Tests
+    if: inputs.full
+    needs: check
+    runs-on: ubuntu-latest
+
+    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: Install Playwright browsers
         run: cd frontend && bunx playwright install --with-deps chromium