feat: 促销系统完善、发票页重构、前端中文化、订单表迁移及多项优化

前端：

- 发票页完整重构：智能按钮状态、防重复开票、空态引导、订单多选

- 全局中文化：Ant Design Vue locale配置、清除残留英文UI文本

- 新增关于我们、联系我们页面

- 首页活动专区、搜索页、Skill详情等多处优化

后端：

- 订单模块：新增original_amount/promotion_deduct_amount字段及DB迁移

- 促销系统：完善促销规则、过期任务、批量查询等

- 新增RateLimit注解及拦截器、CORS过滤器、Health检查接口

- Logback日志配置、points枚举修复等

frontend/src/views/join-us/index.vue

@@ -204,12 +204,34 @@
             <div class="form-tip">支持 MP4/MOV/AVI/WEBM 格式，最大 100MB；也可粘贴网盘链接</div>
             <a-progress v-if="videoUploading" :percent="videoProgress" size="small" style="margin-top: 4px" />
           </a-form-item>
-          <a-form-item label="作品链接" name="portfolioUrl">
-            <a-input v-model:value="form.portfolioUrl" placeholder="请输入个人作品集或GitHub链接（选填）">
-              <template #prefix>
-                <desktop-outlined />
-              </template>
-            </a-input>
+          <a-form-item label="作品集" name="portfolioUrl">
+            <div class="upload-area">
+              <a-upload
+                :file-list="portfolioFileList"
+                :before-upload="beforePortfolioUpload"
+                :custom-request="handlePortfolioUpload"
+                :max-count="5"
+                multiple
+                accept=".zip,.rar,.7z,.tar.gz,.pdf,.doc,.docx,.ppt,.pptx,.png,.jpg,.jpeg,.gif"
+                @remove="handlePortfolioRemove"
+              >
+                <a-button :loading="portfolioUploading">
+                  <template #icon><upload-outlined /></template>
+                  {{ portfolioUploading ? '上传中...' : '选择作品文件' }}
+                </a-button>
+              </a-upload>
+              <div class="upload-or">或</div>
+              <a-input
+                v-model:value="form.portfolioUrl"
+                placeholder="粘贴作品集链接（GitHub、网盘等）"
+                :disabled="!!portfolioFileList.length"
+                style="flex: 1"
+              >
+                <template #prefix><link-outlined /></template>
+              </a-input>
+            </div>
+            <div class="form-tip">支持 ZIP/RAR/PDF/图片等格式，单文件最大 50MB，最多 5 个；也可粘贴链接</div>
+            <a-progress v-if="portfolioUploading" :percent="portfolioProgress" size="small" style="margin-top: 4px" />
           </a-form-item>
 
           <a-form-item label="期望收益" name="expectedIncome">
@@ -325,12 +347,17 @@ import {
   ProjectOutlined,
   DollarCircleOutlined,
   CheckCircleFilled,
+  CheckCircleOutlined,
   TrophyOutlined,
   StarOutlined,
   UploadOutlined,
   VideoCameraOutlined,
   LinkOutlined,
-  DesktopOutlined
+  DesktopOutlined,
+  WalletOutlined,
+  RiseOutlined,
+  TeamOutlined,
+  RightOutlined
 } from '@ant-design/icons-vue'
 
 const formRef = ref(null)
@@ -347,6 +374,11 @@ const videoFileList = ref([])
 const videoUploading = ref(false)
 const videoProgress = ref(0)
 
+// 作品集上传状态
+const portfolioFileList = ref([])
+const portfolioUploading = ref(false)
+const portfolioProgress = ref(0)
+
 const form = reactive({
   realName: '',
   phone: '',
@@ -488,6 +520,50 @@ const handleVideoRemove = () => {
   videoProgress.value = 0
 }
 
+// 作品集上传前校验
+const beforePortfolioUpload = (file) => {
+  if (file.size > 50 * 1024 * 1024) {
+    message.error('单个文件大小不能超过 50MB')
+    return false
+  }
+  return true
+}
+
+// 作品集上传处理
+const handlePortfolioUpload = async ({ file, onSuccess, onError }) => {
+  portfolioUploading.value = true
+  portfolioProgress.value = 0
+  const progressTimer = setInterval(() => {
+    if (portfolioProgress.value < 90) portfolioProgress.value += 10
+  }, 200)
+  try {
+    const res = await uploadApi.uploadFile('portfolio', file)
+    clearInterval(progressTimer)
+    portfolioProgress.value = 100
+    const url = res.data?.url || res.data?.fileUrl
+    portfolioFileList.value = [...portfolioFileList.value, { uid: file.uid, name: file.name, status: 'done', url }]
+    // 将所有已上传文件URL用逗号拼接存入portfolioUrl
+    form.portfolioUrl = portfolioFileList.value.map(f => f.url).join(',')
+    onSuccess(res, file)
+    message.success('文件上传成功')
+  } catch (err) {
+    clearInterval(progressTimer)
+    onError(err)
+    message.error('文件上传失败：' + (err.response?.data?.message || err.message))
+  } finally {
+    portfolioUploading.value = false
+    portfolioProgress.value = 0
+  }
+}
+
+// 作品集文件删除
+const handlePortfolioRemove = (file) => {
+  portfolioFileList.value = portfolioFileList.value.filter(f => f.uid !== file.uid)
+  form.portfolioUrl = portfolioFileList.value.length
+    ? portfolioFileList.value.map(f => f.url).join(',')
+    : ''
+}
+
 const rules = {
   realName: [{ required: true, message: '请输入真实姓名', trigger: 'blur' }],
   phone: [
@@ -544,6 +620,8 @@ const resetForm = () => {
   resumeProgress.value = 0
   videoFileList.value = []
   videoProgress.value = 0
+  portfolioFileList.value = []
+  portfolioProgress.value = 0
 }
 </script>