Add CI workflow

.gitea/workflows/ci.yaml

@@ -0,0 +1,33 @@
+name: CI / Build
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js for API
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Install API Dependencies
+        working-directory: ./api
+        run: npm install
+
+      - name: Install Frontend Dependencies
+        working-directory: ./frontend
+        run: npm install
+
+      - name: Run Backend Syntax Check
+        working-directory: ./api
+        run: node -c server.js
+
+      - name: CI Completed Successfully
+        run: echo "🎉 Build and checks passed successfully!"