ci(actions): add PR validation workflow

.github/workflows/pr-check.yml

@@ -0,0 +1,86 @@
+name: PR Check
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  frontend:
+    name: Frontend
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '24'
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Type check
+        run: npm run type-check
+
+      - name: Lint
+        run: npm run lint
+
+      - name: Build
+        run: npm run build
+        env:
+          VERSION: ci
+
+  usage-service:
+    name: Usage Service
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.24.x'
+          cache-dependency-path: usage-service/go.sum
+
+      - name: Test
+        working-directory: usage-service
+        run: go test ./...
+
+  docker-build:
+    name: Docker Build
+    runs-on: ubuntu-latest
+    needs:
+      - frontend
+      - usage-service
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build Usage Service image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: Dockerfile.usage-service
+          push: false
+          build-args: |
+            VERSION=ci