feat: delegate 客户端替换为 hyper 原生实现，新增代理管理功能

aether-proxy:
- 用 hyper-util Client + 自定义 InstrumentedConnector 替换 reqwest delegate 客户端
- 支持 HTTP/HTTPS 自动 TLS，ALPN h2 协商，connect/tls 分阶段计时
- ConnectTiming 通过 hyper extensions 传递，上游响应细分 connect_ms/tls_ms/ttfb_ms
- upgrade 命令在非 root 下跳过 systemd restart 并提示手动操作

后端:
- 新增 /admin/proxy-nodes/test-url 接口，支持直接测试代理 URL 连通性
- 新增 /admin/proxy-nodes/hmac-key 接口，获取 HMAC Key 供部署使用
- 提取 _test_proxy_connectivity 公共函数，消除 test_node 中的重复代码
- candidate_resolver 在 extra_data 中输出 needs_conversion/provider_api_format
- stats_aggregator 小时聚合增加 IntegrityError 冲突重试

前端:
- 请求时间线组件展示代理 timing 细分（DNS/连接/TLS/TTFB/上游处理）
- 请求时间线增加格式转换分界标记和 conversion badge
- ProxyNodes 页面新增代理 URL 测试和 HMAC Key 复制功能
- HardwareTooltip 从 Popover 改为 Tooltip 组件

frontend/src/views/admin/ProxyNodes.vue

@@ -96,14 +96,24 @@
             </Select>
             <div class="h-4 w-px bg-border" />
             <Button
-              size="sm"
-              class="h-8 text-xs"
-              @click="showAddDialog = true"
+              variant="ghost"
+              size="icon"
+              class="h-8 w-8"
+              title="复制 HMAC Key"
+              @click="copyHmacKey"
             >
-              <Plus class="w-3.5 h-3.5 mr-1" />
-              手动添加
+              <Copy class="w-3.5 h-3.5" />
             </Button>
             <div class="h-4 w-px bg-border" />
+            <Button
+              variant="ghost"
+              size="icon"
+              class="h-8 w-8"
+              title="手动添加"
+              @click="showAddDialog = true"
+            >
+              <Plus class="w-3.5 h-3.5" />
+            </Button>
             <RefreshButton
               :loading="store.loading"
               @click="refresh"
@@ -429,18 +439,29 @@
       </form>
 
       <template #footer>
-        <Button
-          variant="outline"
-          @click="handleDialogClose(false)"
-        >
-          取消
-        </Button>
-        <Button
-          :disabled="addingNode || !addForm.name || !addForm.proxy_url"
-          @click="editingNode ? handleUpdateManualNode() : handleAddManualNode()"
-        >
-          {{ addingNode ? (editingNode ? '保存中...' : '添加中...') : (editingNode ? '保存' : '添加') }}
-        </Button>
+        <div class="flex items-center justify-between w-full">
+          <Button
+            variant="outline"
+            :disabled="testingUrl || !addForm.proxy_url"
+            @click="handleTestUrl"
+          >
+            {{ testingUrl ? '测试中...' : '测试' }}
+          </Button>
+          <div class="flex items-center gap-2">
+            <Button
+              variant="outline"
+              @click="handleDialogClose(false)"
+            >
+              取消
+            </Button>
+            <Button
+              :disabled="addingNode || !addForm.name || !addForm.proxy_url"
+              @click="editingNode ? handleUpdateManualNode() : handleAddManualNode()"
+            >
+              {{ addingNode ? (editingNode ? '保存中...' : '添加中...') : (editingNode ? '保存' : '添加') }}
+            </Button>
+          </div>
+        </div>
       </template>
     </Dialog>
 
@@ -539,6 +560,7 @@
 import { ref, computed, onMounted, watch } from 'vue'
 import { useProxyNodesStore } from '@/stores/proxy-nodes'
 import { useToast } from '@/composables/useToast'
+import { useClipboard } from '@/composables/useClipboard'
 import { useConfirm } from '@/composables/useConfirm'
 import { proxyNodesApi, type ProxyNode, type ProxyNodeRemoteConfig } from '@/api/proxy-nodes'
 
@@ -564,11 +586,12 @@ import {
   Dialog,
 } from '@/components/ui'
 
-import { Search, Trash2, Plus, SquarePen, Activity, Loader2, Settings } from 'lucide-vue-next'
+import { Search, Trash2, Plus, SquarePen, Activity, Loader2, Settings, Copy } from 'lucide-vue-next'
 import { formatRegion } from '@/utils/region'
 import HardwareTooltip from './components/HardwareTooltip.vue'
 
 const { success, error: toastError } = useToast()
+const { copyToClipboard } = useClipboard()
 const { confirmDanger } = useConfirm()
 const store = useProxyNodesStore()
 
@@ -602,6 +625,7 @@ const configForm = ref({
 
 // 测试连通性
 const testingNodes = ref(new Set<string>())
+const testingUrl = ref(false)
 
 const filteredNodes = computed(() => {
   let filtered = [...store.nodes]
@@ -638,6 +662,38 @@ async function refresh() {
   await store.fetchNodes()
 }
 
+async function handleTestUrl() {
+  if (!addForm.value.proxy_url || testingUrl.value) return
+  testingUrl.value = true
+  try {
+    const result = await proxyNodesApi.testProxyUrl({
+      proxy_url: addForm.value.proxy_url,
+      username: addForm.value.username || undefined,
+      password: addForm.value.password || undefined,
+    })
+    if (result.success) {
+      const parts = [`延迟: ${result.latency_ms}ms`]
+      if (result.exit_ip) parts.push(`出口IP: ${result.exit_ip}`)
+      success(`连通性测试通过，${parts.join('，')}`)
+    } else {
+      toastError(`连通性测试失败: ${result.error || '未知错误'}`)
+    }
+  } catch (err: any) {
+    toastError(err.response?.data?.error?.message || '测试请求失败')
+  } finally {
+    testingUrl.value = false
+  }
+}
+
+async function copyHmacKey() {
+  try {
+    const { proxy_hmac_key } = await proxyNodesApi.getHmacKey()
+    await copyToClipboard(proxy_hmac_key)
+  } catch (err: any) {
+    toastError(err.response?.data?.error?.message || err.response?.data?.detail || '获取 HMAC Key 失败')
+  }
+}
+
 function handleEdit(node: ProxyNode) {
   editingNode.value = node
   addForm.value = {

frontend/src/views/admin/components/HardwareTooltip.vue

@@ -1,9 +1,10 @@
 <script setup lang="ts">
 import type { ProxyNode } from '@/api/proxy-nodes'
 import {
-  Popover,
-  PopoverContent,
-  PopoverTrigger,
+  Tooltip,
+  TooltipContent,
+  TooltipProvider,
+  TooltipTrigger,
 } from '@/components/ui'
 import { Cpu } from 'lucide-vue-next'
 import { computed } from 'vue'
@@ -76,36 +77,37 @@ function formatNumber(n: number) {
 </script>
 
 <template>
-  <Popover v-if="showHardwareInfo">
-    <PopoverTrigger as-child>
-      <button
-        type="button"
-        title="Hardware info"
-        aria-label="Hardware info"
-        class="inline-flex items-center justify-center rounded-sm p-0.5 hover:bg-muted/60 transition-colors"
-      >
-        <Cpu class="h-3.5 w-3.5 text-muted-foreground" />
-      </button>
-    </PopoverTrigger>
-    <PopoverContent
-      side="right"
-      :side-offset="8"
-      class="w-auto p-3 text-xs space-y-1"
-    >
-      <div
-        v-if="hardwareRows.length === 0"
-        class="text-muted-foreground"
-      >
-        No hardware info reported.
-      </div>
-      <template v-else>
-        <div
-          v-for="row in hardwareRows"
-          :key="row.label"
+  <TooltipProvider v-if="showHardwareInfo">
+    <Tooltip>
+      <TooltipTrigger as-child>
+        <button
+          type="button"
+          aria-label="硬件信息"
+          class="inline-flex items-center justify-center rounded-sm p-0.5 hover:bg-muted/60 transition-colors"
         >
-          {{ row.label }}: {{ row.value }}
+          <Cpu class="h-3.5 w-3.5 text-muted-foreground" />
+        </button>
+      </TooltipTrigger>
+      <TooltipContent
+        side="right"
+        :side-offset="8"
+        class="w-auto px-3 py-2 text-xs space-y-1"
+      >
+        <div
+          v-if="hardwareRows.length === 0"
+          class="text-muted-foreground"
+        >
+          No hardware info reported.
         </div>
-      </template>
-    </PopoverContent>
-  </Popover>
+        <template v-else>
+          <div
+            v-for="row in hardwareRows"
+            :key="row.label"
+          >
+            {{ row.label }}: {{ row.value }}
+          </div>
+        </template>
+      </TooltipContent>
+    </Tooltip>
+  </TooltipProvider>
 </template>