feat: worker 日志 CSV 导出 + 集群日志导出菜单完善

- handleAuditWorkerLogsCsv: 全环 fan-out 收集每节点 frpc 日志,
  逐行展开为 CSV (node/worker_key/remote/worker_state/log_line),
  Excel 可直接过滤/pivot 审计
- gatherClusterWorkerLogs: 提取 JSON 与 CSV 共用的日志聚合逻辑
- 路由: GET /audit/worker-logs.csv (read 级)
- ClusterView: 导出 worker 日志改下拉菜单 (JSON/CSV 两格式)
- api.ts: downloadAuditCsv 支持 worker-logs 类型
- gofmt: handlers_audit.go 格式对齐

web/src/api.ts

@@ -251,7 +251,7 @@ export const api = {
 
 // downloadAuditCsv streams one of the /audit/*.csv endpoints to a file.
 export async function downloadAuditCsv(
-	kind: "users" | "apikeys" | "cluster-log",
+	kind: "users" | "apikeys" | "cluster-log" | "worker-logs",
 ): Promise<void> {
 	const resp = await fetch(`/api/manager/audit/${kind}.csv`, {
 		credentials: "same-origin",

web/src/views/ClusterView.vue

@@ -154,9 +154,15 @@
                 </el-dropdown-menu>
               </template>
             </el-dropdown>
-            <button class="w4f-btn ghost small" :disabled="workerLogBusy" @click="exportWorkerLogs">
-              ⤓ 导出 worker 日志
-            </button>
+            <el-dropdown trigger="click" :disabled="workerLogBusy" @command="exportWorkerLogs">
+              <button class="w4f-btn ghost small" :disabled="workerLogBusy">⤓ 导出 worker 日志</button>
+              <template #dropdown>
+                <el-dropdown-menu>
+                  <el-dropdown-item command="json">JSON（完整结构）</el-dropdown-item>
+                  <el-dropdown-item command="csv">CSV（审计用，逐行展开）</el-dropdown-item>
+                </el-dropdown-menu>
+              </template>
+            </el-dropdown>
           </div>
         </h3>
         <div class="log-list">
@@ -365,9 +371,15 @@ const exportLog = async (fmt: string) => {
 // logs (the actual forwards running on each node) into one downloadable JSON.
 // Read-level: auditors use this to inspect worker output cluster-wide.
 const workerLogBusy = ref(false)
-const exportWorkerLogs = async () => {
+const exportWorkerLogs = async (fmt = 'json') => {
   workerLogBusy.value = true
   try {
+    if (fmt === 'csv') {
+      // Server-side CSV: ring-wide fan-out, one row per log line.
+      await downloadAuditCsv('worker-logs')
+      ElMessage.success('已导出 worker 日志 CSV')
+      return
+    }
     const bundle = await api.exportWorkerLogs()
     const blob = new Blob([JSON.stringify(bundle, null, 2)], { type: 'application/json' })
     const url = URL.createObjectURL(blob)