Add SonarQube CI workflow

.gitea/workflows/sonarqube.yml

@@ -0,0 +1,50 @@
+name: SonarQube Analysis
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    types: [opened, synchronize, reopened]
+  workflow_dispatch:
+
+jobs:
+  sonarqube:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Install backend deps
+        run: npm install
+        working-directory: backend
+
+      - name: Install frontend deps
+        run: npm install
+        working-directory: frontend
+
+      - name: TypeScript build check (backend)
+        run: npm run build
+        working-directory: backend
+
+      - name: TypeScript build check (frontend)
+        run: npm run build
+        working-directory: frontend
+
+      - name: SonarQube Scan
+        uses: sonarsource/sonarqube-scan-action@v4
+        env:
+          SONAR_HOST_URL: ${{ secrets.SONAR_HOST_URL }}
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
+        with:
+          args: >
+            -Dsonar.projectKey=redefined-designs
+            -Dsonar.login=${{ secrets.SONAR_TOKEN }}
+            -Dsonar.sources=backend/src,frontend/src
+            -Dsonar.exclusions=**/node_modules/**,**/dist/**