INIT(deploy): portfolio project setup

Add complete portfolio project including:
- Next.js application in services/nextjs
- Docker configurations for dev and prod
- Kubernetes deployment manifests with kustomize
- ArgoCD application configuration
- GitHub Actions workflow for automated builds

.github/workflows/ci.yml

@@ -0,0 +1,45 @@
+name: CI
+
+on:
+  push:
+    branches: [main, develop]
+  pull_request:
+    branches: [main, develop]
+
+jobs:
+  lint-and-build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+          cache-dependency-path: services/nextjs/package-lock.json
+
+      - name: Install dependencies
+        working-directory: services/nextjs
+        run: npm ci
+
+      - name: Run ESLint
+        working-directory: services/nextjs
+        run: npm run lint
+
+      - name: Build Next.js application
+        working-directory: services/nextjs
+        run: npm run build
+        env:
+          NEXT_TELEMETRY_DISABLED: 1
+
+      - name: Check build output
+        working-directory: services/nextjs
+        run: |
+          if [ ! -d ".next" ]; then
+            echo "Build failed: .next directory not found"
+            exit 1
+          fi
+          echo "✅ Build completed successfully"