fix: Resolve npm ci missing package-lock.json issue

- Change npm ci to npm install in CI/CD workflows
- Update cache key to use package.json instead of package-lock.json
- Fix dependency installation in GitHub Actions
- Ensure CI/CD works without committed lockfile

Fixes:
✅ npm ci missing package-lock.json error
✅ Cache key resolution issues
✅ Dependency installation in CI/CD
✅ More reliable frontend builds

Author: Dang

.github/workflows/frontend-ci.yml

@@ -28,13 +28,13 @@ jobs:
       uses: actions/cache@v3
       with:
         path: VehicleShowroom/node_modules
-        key: ${{ runner.os }}-npm-${{ hashFiles('VehicleShowroom/package-lock.json') }}
+        key: ${{ runner.os }}-npm-${{ hashFiles('VehicleShowroom/package.json') }}
         restore-keys: |
           ${{ runner.os }}-npm-
         
     - name: Install dependencies
       working-directory: ./VehicleShowroom
-      run: npm ci
+      run: npm install
 
     - name: Run tests
       working-directory: ./VehicleShowroom
@@ -61,13 +61,13 @@ jobs:
       uses: actions/cache@v3
       with:
         path: VehicleShowroom/node_modules
-        key: ${{ runner.os }}-npm-${{ hashFiles('VehicleShowroom/package-lock.json') }}
+        key: ${{ runner.os }}-npm-${{ hashFiles('VehicleShowroom/package.json') }}
         restore-keys: |
           ${{ runner.os }}-npm-
         
     - name: Install dependencies
       working-directory: ./VehicleShowroom
-      run: npm ci
+      run: npm install
 
     - name: Build application
       working-directory: ./VehicleShowroom

.github/workflows/fullstack-ci.yml

@@ -23,13 +23,13 @@ jobs:
       uses: actions/cache@v3
       with:
         path: VehicleShowroom/node_modules
-        key: ${{ runner.os }}-npm-${{ hashFiles('VehicleShowroom/package-lock.json') }}
+        key: ${{ runner.os }}-npm-${{ hashFiles('VehicleShowroom/package.json') }}
         restore-keys: |
           ${{ runner.os }}-npm-
         
     - name: Install frontend dependencies
       working-directory: ./VehicleShowroom
-      run: npm ci
+      run: npm install
 
     - name: Run frontend tests
       working-directory: ./VehicleShowroom