fix: Resolve GitHub Actions npm cache issue

- Replace setup-node cache with manual cache action
- Use actions/cache@v3 for better npm dependency caching
- Fix cache path resolution issues
- Improve CI/CD reliability and performance

Fixes:
✅ npm cache path resolution error
✅ Better dependency caching strategy
✅ More reliable CI/CD workflows

Author: Dang

.github/workflows/frontend-ci.yml

@@ -23,8 +23,14 @@ jobs:
       uses: actions/setup-node@v4
       with:
         node-version: '18'
-        cache: 'npm'
-        cache-dependency-path: VehicleShowroom/package-lock.json
+        
+    - name: Cache npm dependencies
+      uses: actions/cache@v3
+      with:
+        path: VehicleShowroom/node_modules
+        key: ${{ runner.os }}-npm-${{ hashFiles('VehicleShowroom/package-lock.json') }}
+        restore-keys: |
+          ${{ runner.os }}-npm-
         
     - name: Install dependencies
       working-directory: ./VehicleShowroom
@@ -50,8 +56,14 @@ jobs:
       uses: actions/setup-node@v4
       with:
         node-version: '18'
-        cache: 'npm'
-        cache-dependency-path: VehicleShowroom/package-lock.json
+        
+    - name: Cache npm dependencies
+      uses: actions/cache@v3
+      with:
+        path: VehicleShowroom/node_modules
+        key: ${{ runner.os }}-npm-${{ hashFiles('VehicleShowroom/package-lock.json') }}
+        restore-keys: |
+          ${{ runner.os }}-npm-
         
     - name: Install dependencies
       working-directory: ./VehicleShowroom
@@ -93,4 +105,4 @@ jobs:
         service-id: ${{ secrets.RENDER_SERVICE_ID }}
         api-key: ${{ secrets.RENDER_API_KEY }}
         build-command: echo "Using pre-built artifacts"
-        publish-directory: VehicleShowroom/build
+        publish-directory: VehicleShowroom/build

.github/workflows/fullstack-ci.yml

@@ -18,8 +18,14 @@ jobs:
       uses: actions/setup-node@v4
       with:
         node-version: '18'
-        cache: 'npm'
-        cache-dependency-path: VehicleShowroom/package-lock.json
+        
+    - name: Cache npm dependencies
+      uses: actions/cache@v3
+      with:
+        path: VehicleShowroom/node_modules
+        key: ${{ runner.os }}-npm-${{ hashFiles('VehicleShowroom/package-lock.json') }}
+        restore-keys: |
+          ${{ runner.os }}-npm-
         
     - name: Install frontend dependencies
       working-directory: ./VehicleShowroom
@@ -80,4 +86,4 @@ jobs:
         echo "   1. Go to render.com"
         echo "   2. Use Blueprint deployment with render.yaml"
         echo "   3. Set environment variables"
-        echo "   4. Deploy both services"
+        echo "   4. Deploy both services"