feat: use only installed Node.js - no installation

NODE.JS OPTIMIZATION: Use existing installation only, no matrix

Changes:
✅ Removed Node.js matrix (20, 24) - using single installed version
✅ Removed all Node.js installation logic
✅ Uses only installed Node.js 24.13.0
✅ Simplified workflow - single job instead of matrix
✅ Updated coverage upload - no matrix condition

Benefits:
- Faster execution (no installation steps)
- Uses production Node.js 24.13.0 directly
- Simpler workflow configuration
- No network requests for NodeSource scripts
- Consistent testing environment
- Reduced CI/CD execution time

Rationale:
- gitea-runner has Node.js 24.13.0 installed
- No need to install additional versions
- Focus on testing with actual production environment
- Eliminate installation overhead and complexity

This makes CLI testing much faster and simpler while using
the exact Node.js version that's available in production.

.gitea/workflows/cli-level1-tests.yml

@@ -19,9 +19,10 @@ jobs:
   test-cli-level1:
     runs-on: debian 
     
-    strategy:
-      matrix:
-        node-version: [20, 24]
+    # strategy:
+#     matrix:
+#       node-version: [20, 24]
+# Using installed Node.js version only
         
     steps:
       - name: Nuclear fix - absolute path control
@@ -49,23 +50,16 @@ jobs:
             echo "✅ Node.js project detected!"
             echo "=== NODE.JS SETUP ==="
             echo "Current Node.js version: $(node -v)"
-            echo "Target Node.js version: ${{ matrix.node-version }}"
+            echo "Using installed Node.js version - no installation needed"
             
-            # Node.js version management
-            if [[ "${{ matrix.node-version }}" == "24" ]]; then
-              echo "✅ Node.js 24 already installed and current"
-              echo "Skipping installation - using existing Node.js 24.13.0"
-            elif [[ "${{ matrix.node-version }}" == "20" ]]; then
-              echo "Installing Node.js 20 LTS for stability testing..."
-              curl -fsSL https://deb.nodesource.com/setup_20.x | bash -
-              apt-get install -y nodejs
-              echo "Node.js 20 installed: $(node -v)"
-            else
-              echo "Installing Node.js ${{ matrix.node-version }}..."
-              curl -fsSL https://deb.nodesource.com/setup_${{ matrix.node-version }}.x | bash -
-              apt-get install -y nodejs
+            # Verify Node.js is available
+            if ! command -v node >/dev/null 2>&1; then
+              echo "❌ Node.js not found - please install Node.js first"
+              exit 1
             fi
             
+            echo "✅ Node.js $(node -v) is available and ready"
+            
             echo "=== NPM INSTALL ==="
             npm install --legacy-peer-deps
             
@@ -141,7 +135,6 @@ jobs:
           fi
 
       - name: Upload coverage reports
-        if: matrix.node-version == '24'
         run: |
           cd /opt/gitea-runner/cli-workspace/repo
           if [ -f "package.json" ]; then