重构学员证书签发与批量导入流程

frontend/src/views/AdminImports.vue

@@ -5,25 +5,26 @@
         <h2>Excel 导入</h2>
         <p>上传后先校验，确认导入后才会正式写入学员和证书数据。</p>
       </div>
-      <el-button @click="downloadTemplate">下载模板</el-button>
+      <el-button :disabled="!selectedTemplate" @click="downloadTemplate">下载所选模板</el-button>
     </header>
 
     <el-alert
       class="import-tip"
       type="info"
       :closable="false"
-      title="课程开始日期、课程结束日期和发证日期均为必填项，请统一使用 YYYY-MM-DD 格式，例如 2026-06-01。"
+      title="请先选择证书模板，再下载对应 Excel。不同证书模板的列和必填项不同，不要混用文件。"
     />
 
     <div class="batch-template">
       <div>
         <strong>本批次证书模板</strong>
-        <span>确认导入后，整批证书都会固化为所选模板。</span>
+        <span>下载、校验和正式签发都以本次选择为准。</span>
       </div>
       <el-select v-model="templateCode" placeholder="选择证书模板">
         <el-option v-for="item in templates" :key="item.code" :label="item.name" :value="item.code" />
       </el-select>
       <img v-if="selectedTemplate" :src="selectedTemplate.preview_url" :alt="selectedTemplate.name" />
+      <p v-if="selectedTemplate" class="template-fields">Excel 字段：{{ selectedImportColumns.join("、") }}</p>
     </div>
 
     <el-upload
@@ -129,6 +130,12 @@ let pregenerationTimer: number | null = null;
 
 const pregenerationDone = computed(() => ["completed", "completed_with_errors"].includes(pregenerationJob.value?.status || ""));
 const selectedTemplate = computed(() => templates.value.find((item) => item.code === templateCode.value));
+const selectedImportColumns = computed(() => [
+  "姓名",
+  "手机号",
+  "项目代码",
+  ...(selectedTemplate.value?.dynamic_fields.filter((field) => field !== "姓名") || []),
+]);
 
 function templateName(code: string) {
   return templates.value.find((item) => item.code === code)?.name || code;
@@ -149,7 +156,11 @@ function pickFile(file: UploadFile) {
 }
 
 function downloadTemplate() {
-  downloadFile("/admin/import-batches/template", "certificate-import-template.xlsx");
+  if (!selectedTemplate.value) return;
+  downloadFile(
+    `/admin/import-batches/template?template_code=${encodeURIComponent(templateCode.value)}`,
+    `certificate-import-${templateCode.value}.xlsx`,
+  );
 }
 
 async function loadBatches() {
@@ -291,6 +302,13 @@ onUnmounted(stopPregenerationPolling);
   border: 1px solid #edf2f4;
 }
 
+.template-fields {
+  grid-column: 1 / -1;
+  margin: 0;
+  color: var(--app-muted);
+  font-size: 13px;
+}
+
 .import-tip {
   margin-bottom: 4px;
 }