feat: 前端配置代理解决上传跨域问题

- 配置 Vite 开发服务器代理 /api 和 /uploads 到后端
- API baseURL 改为相对路径 '/api'
- 修改上传 action 为相对路径 '/api/upload/image'
- 移除后端 FileUploadController 的 @CrossOrigin 注解
- 恢复 WebMvcConfig 的拦截器配置

frontend/src/api/http.js

@@ -1,7 +1,7 @@
 import axios from 'axios'
 
 const http = axios.create({
-  baseURL: 'http://localhost:8080',
+  baseURL: '/api',
   timeout: 10000
 })
 

frontend/src/views/admin/AdminBanners.vue

@@ -90,7 +90,7 @@ const banners = ref([])
 const bannerModalVisible = ref(false)
 const bannerForm = reactive({ id: null, imageUrl: '', linkUrl: '', sortNo: 1, enabled: true })
 
-const uploadAction = 'http://localhost:8080/api/upload/image'
+const uploadAction = '/api/upload/image'
 const uploadHeaders = computed(() => ({
   'X-Token': localStorage.getItem('token') || ''
 }))

frontend/src/views/admin/AdminProducts.vue

@@ -126,7 +126,7 @@ const merchantOptions = ref([])
 const productModalVisible = ref(false)
 const productForm = reactive({ id: null, name: '', category: '', description: '', price: 0, stock: 0, imageUrl: '', merchantId: null, approved: false })
 
-const uploadAction = 'http://localhost:8080/api/upload/image'
+const uploadAction = '/api/upload/image'
 const uploadHeaders = computed(() => ({
   'X-Token': localStorage.getItem('token') || ''
 }))

frontend/src/views/merchant/MerchantProducts.vue

@@ -110,7 +110,7 @@ const products = ref([])
 const productModalVisible = ref(false)
 const productForm = reactive({ id: null, name: '', category: '', description: '', price: 0, stock: 0, imageUrl: '', approved: false })
 
-const uploadAction = 'http://localhost:8080/api/upload/image'
+const uploadAction = '/api/upload/image'
 const uploadHeaders = computed(() => ({
   'X-Token': localStorage.getItem('token') || ''
 }))

frontend/vite.config.js

@@ -4,6 +4,18 @@ import vue from '@vitejs/plugin-vue'
 export default defineConfig({
   plugins: [vue()],
   server: {
-    port: 5173
+    port: 5173,
+    proxy: {
+      '/api': {
+        target: 'http://localhost:8080',
+        changeOrigin: true,
+        secure: false
+      },
+      '/uploads': {
+        target: 'http://localhost:8080',
+        changeOrigin: true,
+        secure: false
+      }
+    }
   }
 })