fix(frontend): HardwareTooltip 组件健壮性重构

- hardware_info 支持 string/object/null 类型的安全解析
- 用 computed 统一提取展示行，无硬件信息时显示提示文案
- 增加 button 的 title/aria-label 属性

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

@@ -6,8 +6,61 @@ import {
   PopoverTrigger,
 } from '@/components/ui'
 import { Cpu } from 'lucide-vue-next'
+import { computed } from 'vue'
 
-defineProps<{ node: ProxyNode }>()
+const props = defineProps<{ node: ProxyNode }>()
+
+const hardwareInfo = computed<Record<string, any> | null>(() => {
+  const info = props.node.hardware_info
+  if (info == null) return null
+  if (typeof info === 'string') {
+    try {
+      const parsed = JSON.parse(info)
+      if (parsed && typeof parsed === 'object') return parsed as Record<string, any>
+    } catch {
+      return {}
+    }
+    return {}
+  }
+  if (typeof info === 'object') return info as Record<string, any>
+  return {}
+})
+
+const hardwareRows = computed(() => {
+  const info = hardwareInfo.value ?? {}
+  const rows: Array<{ label: string; value: string }> = []
+
+  if (info.cpu_cores != null) {
+    rows.push({ label: 'CPU', value: `${info.cpu_cores} cores` })
+  }
+
+  if (info.total_memory_mb != null) {
+    rows.push({ label: 'RAM', value: formatMemory(info.total_memory_mb) })
+  }
+
+  if (info.os_info) {
+    rows.push({ label: 'OS', value: String(info.os_info) })
+  }
+
+  if (props.node.estimated_max_concurrency != null) {
+    rows.push({
+      label: 'Max Concurrency',
+      value: `~${formatNumber(props.node.estimated_max_concurrency)}`,
+    })
+  }
+
+  if (info.fd_limit != null) {
+    rows.push({ label: 'FD Limit', value: formatNumber(info.fd_limit) })
+  }
+
+  return rows
+})
+
+const showHardwareInfo = computed(
+  () =>
+    !props.node.is_manual
+    && (hardwareInfo.value !== null || props.node.estimated_max_concurrency != null)
+)
 
 function formatMemory(mb: number | null) {
   if (mb == null) return '-'
@@ -23,10 +76,12 @@ function formatNumber(n: number) {
 </script>
 
 <template>
-  <Popover v-if="!node.is_manual && node.hardware_info">
+  <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" />
@@ -37,21 +92,20 @@ function formatNumber(n: number) {
       :side-offset="8"
       class="w-auto p-3 text-xs space-y-1"
     >
-      <div v-if="node.hardware_info.cpu_cores">
-        CPU: {{ node.hardware_info.cpu_cores }} cores
-      </div>
-      <div v-if="node.hardware_info.total_memory_mb">
-        RAM: {{ formatMemory(node.hardware_info.total_memory_mb) }}
-      </div>
-      <div v-if="node.hardware_info.os_info">
-        OS: {{ node.hardware_info.os_info }}
-      </div>
-      <div v-if="node.estimated_max_concurrency">
-        Max Concurrency: ~{{ formatNumber(node.estimated_max_concurrency) }}
-      </div>
-      <div v-if="node.hardware_info.fd_limit">
-        FD Limit: {{ formatNumber(node.hardware_info.fd_limit) }}
+      <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"
+        >
+          {{ row.label }}: {{ row.value }}
+        </div>
+      </template>
     </PopoverContent>
   </Popover>
 </template>