refactor: enhance quiz retrieval and schema consistency

- Improved quiz retrieval logic by ensuring a valid random index is calculated, preventing errors when no quizzes are available.
- Updated the Quiz schema to streamline field names and enhance clarity, replacing existing fields with more descriptive alternatives.
- Reformatted code for better readability and consistency, adhering to style guidelines for improved maintainability.

.github/workflows/ci.nocache.yml

@@ -0,0 +1,25 @@
+name: CI Nocache
+
+# Controls when the workflow will run
+on:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: self-hosted
+
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - name: Checkout repository with submodules
+        uses: actions/checkout@v4
+        with:
+          submodules: true # Recursively clone submodules
+          token: ${{ secrets.PAT }}
+          fetch-depth: 0 # Fetch full history to avoid issues with shallow clones
+
+      # Pull the latest version of base images and rebuild without cache
+      - name: Build and deploy
+        run: |
+          docker compose pull
+          docker compose build --no-cache
+          docker compose up -d