chore: Update Node.js version in CI workflows for API docs and frontend

### Summary of Changes
- Changed Node.js version from `latest` and `18` to `20` in both `api-docs.yml` and `frontend.yml` CI workflows.
- Adjusted caching keys to reflect the updated Node.js version for improved dependency management.
- Modified test commands in the frontend workflow to include `--run` for better execution control.

### Expected Results
- Ensured compatibility with the latest Node.js features and improvements.
- Streamlined CI processes by aligning Node.js versions across workflows, enhancing consistency and reliability.

.gitea/workflows/frontend.yml

@@ -25,7 +25,7 @@ jobs:
     
     strategy:
       matrix:
-        node-version: [latest]
+        node-version: [20]
         
     steps:
     - name: Checkout code
@@ -70,7 +70,7 @@ jobs:
         
     - name: Run tests
       run: |
-        npm test -- --coverage --reporter=verbose
+        npm test -- --run --coverage --reporter=verbose
         npm run test:coverage
         
     - name: Send results to SonarQube
@@ -104,18 +104,18 @@ jobs:
     - name: Checkout code
       uses: actions/checkout@v4
       
-    - name: Set up Node.js latest
+    - name: Set up Node.js 20
       uses: actions/setup-node@v4
       with:
-        node-version: 'latest'
+        node-version: '20'
         
     - name: Cache npm dependencies
       uses: actions/cache@v4
       with:
         path: ~/.npm
-        key: ${{ runner.os }}-node-18-${{ hashFiles('frontend/package-lock.json') }}
+        key: ${{ runner.os }}-node-20-${{ hashFiles('frontend/package-lock.json') }}
         restore-keys: |
-          ${{ runner.os }}-node-18-
+          ${{ runner.os }}-node-20-
           ${{ runner.os }}-node-
         
     - name: Install dependencies