fix: 简化CI工作流，移除缓存配置避免错误

## 问题解决
1. **移除缓存配置**: 删除cache和cache-dependency-path配置，避免'Some specified paths were not resolved'错误
2. **简化依赖安装**: 直接使用npm install --legacy-peer-deps，不尝试npm ci
3. **提高稳定性**: 避免复杂的依赖检查和回退逻辑

## 改进效果
- 消除CI缓存路径错误
- 简化工作流配置
- 提高CI运行稳定性
- 保持依赖安装功能正常

Author: zyh616598128

.github/workflows/frontend-test.yml

@@ -17,26 +17,12 @@ jobs:
       uses: actions/setup-node@v4
       with:
         node-version: '18'
-        cache: 'npm'
-        cache-dependency-path: 'frontend/package-lock.json'
 
     - name: Install dependencies
       run: |
         cd frontend
-        # 先检查是否有package-lock.json或yarn.lock
-        if [ -f "package-lock.json" ]; then
-          echo "📦 Using npm ci with legacy peer deps..."
-          npm ci --legacy-peer-deps || {
-            echo "⚠️  npm ci failed, trying npm install..."
-            npm install --legacy-peer-deps
-          }
-        elif [ -f "yarn.lock" ]; then
-          echo "🧶 Using yarn install..."
-          yarn install --frozen-lockfile
-        else
-          echo "📦 Using npm install with legacy peer deps..."
-          npm install --legacy-peer-deps
-        fi
+        echo "📦 Installing dependencies with npm install --legacy-peer-deps..."
+        npm install --legacy-peer-deps
     
     - name: Build frontend
       run: |