Add GitHub Actions CI/CD workflow templates and dynamic coverage badge integration

- Introduced workflow templates for backend (`backend-tests.yml`), frontend (`frontend-tests.yml`), and end-to-end testing (`e2e-tests.yml`), including setup instructions in `.github/workflows/README.md`.
- Added coverage upload to Codecov with dynamic badge generation for test coverage visualization.
- Updated project `README.md` to replace static badges with placeholders for dynamic CI/CD badges.
- Documented CI/CD customization options, including workflows paths, database setup, and deployment workflows.

.github/workflows/frontend-tests.yml.template

@@ -0,0 +1,51 @@
+# Frontend Unit Tests CI Pipeline
+#
+# Rename this file to frontend-tests.yml to enable it
+# This will make the frontend test badges dynamic
+#
+# Required repository secrets:
+# - CODECOV_TOKEN (for coverage upload)
+
+name: Frontend Tests
+
+on:
+  push:
+    branches: [ main, develop ]
+    paths:
+      - 'frontend/**'
+      - '.github/workflows/frontend-tests.yml'
+  pull_request:
+    branches: [ main, develop ]
+    paths:
+      - 'frontend/**'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: '20'
+        cache: 'npm'
+        cache-dependency-path: './frontend/package-lock.json'
+
+    - name: Install dependencies
+      working-directory: ./frontend
+      run: npm ci
+
+    - name: Run unit tests with coverage
+      working-directory: ./frontend
+      run: npm run test:coverage
+
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v4
+      with:
+        files: ./frontend/coverage/coverage-final.json
+        flags: frontend
+        name: frontend-coverage
+        fail_ci_if_error: true
+        token: ${{ secrets.CODECOV_TOKEN }}