fix(ci): add frontend production build step to catch Angular build failures

- Add 'frontend-build' job that runs 'npx ng build --configuration production'
- Wire frontend-build into quality-gate dependencies
- Include feature/multi-admin-roles in CI push branches
- Build failures now fail the pipeline instead of being silently missed

.gitea/workflows/ci.yaml

@@ -2,7 +2,7 @@ name: CI Pipeline
 
 on:
   push:
-    branches: [main, develop, feature/tests-and-ci]
+    branches: [main, develop, feature/tests-and-ci, feature/multi-admin-roles]
   pull_request:
     branches: [main]
 
@@ -36,6 +36,18 @@ jobs:
       - name: Run tests
         run: npx vitest run --reporter=verbose --coverage || true
 
+  frontend-build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+      - name: Install dependencies
+        run: npm ci
+      - name: Build production bundle
+        run: npx ng build --configuration production
+
   backend-lint:
     runs-on: ubuntu-latest
     steps:
@@ -52,13 +64,14 @@ jobs:
 
   quality-gate:
     runs-on: ubuntu-latest
-    needs: [backend-test]
+    needs: [backend-test, frontend-build]
     if: always()
     steps:
       - name: Quality Gate
         run: |
           echo "=== Quality Gate ==="
           echo "Backend tests: enforced (pipeline fails if they don't pass)"
+          echo "Frontend build: enforced (pipeline fails if production build doesn't compile)"
           echo "Coverage threshold: >= 10% (enforced by --cov-fail-under)"
           echo "Quality gate PASSED"
         continue-on-error: false