feat: add CI workflow for backend and frontend with Node.js setup, dependency installation, and testing

Author: EngSteven

.github/workflows/main.yml

@@ -0,0 +1,50 @@
+name: DevTrack Pro CI
+
+on:
+  push:
+    branches: [ main, develop ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  backend-ci:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./backend
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+          cache-dependency-path: './backend/package-lock.json'
+      
+      - name: Install Dependencies
+        run: npm ci
+      
+      - name: Run Tests
+        run: npm run test
+        env:
+          JWT_SECRET: ${{ secrets.JWT_SECRET }} # GitHub Secrets para seguridad
+
+  frontend-ci:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./frontend
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+          cache-dependency-path: './frontend/package-lock.json'
+      
+      - name: Install Dependencies
+        run: npm ci
+      
+      - name: Build Project
+        run: npm run build