ci: add automated test workflow

.github/workflows/test.yml

@@ -0,0 +1,42 @@
+name: Test Suite
+
+on:
+  push:
+    branches: [ main, develop ]
+  pull_request:
+    branches: [ main, develop ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    
+    strategy:
+      matrix:
+        node-version: [24.x]
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: 'npm'
+
+      - name: Install dependencies (backend)
+        working-directory: ./backend
+        run: npm install
+
+      - name: Generate Prisma Client
+        working-directory: ./backend
+        run: npm run prisma:generate
+
+      - name: Run tests (backend)
+        working-directory: ./backend
+        run: npm test
+
+      - name: Build NestJS app
+        working-directory: ./backend
+        run: npm run build
+        continue-on-error: true