feat: 设置语言精简中英+补全时区；构建节点磁盘显示；浏览器 favicon

- 系统设置：界面语言仅保留 简体中文/English；时区按 亚/欧/美/大洋洲
  分组补全 22 个常用时区
- 构建节点：BuildNode 新增 diskInfo 字段（模型/CRUD/seed），卡片显示
  磁盘用量（未上报显示 —），添加/编辑弹窗可维护
- 新增 favicon.svg（主题渐变火箭图标），index.html 注入 icon 链接

backend/internal/database/database.go

@@ -203,9 +203,9 @@ func seedResources() {
 	if n == 0 {
 		hb := time.Now().Add(-10 * time.Second)
 		DB.Create([]model.BuildNode{
-			{Name: "build-host-01", IP: "10.0.8.11", Labels: `["docker","go","java"]`, MaxConcurrency: 4, Status: "online", CurrentJobs: 1, LastHeartbeat: &hb},
+			{Name: "build-host-01", IP: "10.0.8.11", Labels: `["docker","go","java"]`, MaxConcurrency: 4, Status: "online", CurrentJobs: 1, DiskInfo: "78G/200G", LastHeartbeat: &hb},
-			{Name: "build-host-02", IP: "10.0.8.12", Labels: `["docker","nodejs"]`, MaxConcurrency: 2, Status: "busy", CurrentJobs: 2, LastHeartbeat: &hb},
+			{Name: "build-host-02", IP: "10.0.8.12", Labels: `["docker","nodejs"]`, MaxConcurrency: 2, Status: "busy", CurrentJobs: 2, DiskInfo: "156G/500G", LastHeartbeat: &hb},
-			{Name: "build-host-03", IP: "10.0.8.13", Labels: `["python"]`, MaxConcurrency: 2, Status: "offline", LastHeartbeat: &hb},
+			{Name: "build-host-03", IP: "10.0.8.13", Labels: `["python"]`, MaxConcurrency: 2, Status: "offline", DiskInfo: "45G/100G", LastHeartbeat: &hb},
 		})
 	}
 	DB.Model(&model.WebhookEndpoint{}).Count(&n)

backend/internal/handler/resources.go

@@ -394,7 +394,7 @@ func UpdateBuildNode(c *gin.Context) {
 	}
 	var raw map[string]any
 	_ = c.ShouldBindJSON(&raw)
-	for _, k := range []string{"name", "ip", "labels", "maxConcurrency", "workspacePath", "enabled"} {
+	for _, k := range []string{"name", "ip", "labels", "maxConcurrency", "workspacePath", "diskInfo", "enabled"} {
 		if v, ok := raw[k]; ok {
 			database.DB.Model(&n).Update(k, v)
 		}

backend/internal/model/models.go

@@ -204,6 +204,7 @@ type BuildNode struct {
 	Labels         string     `gorm:"type:text" json:"labels"` // JSON ["docker","go"]
 	MaxConcurrency int        `gorm:"default:2" json:"maxConcurrency"`
 	WorkspacePath  string     `gorm:"default:/data/flowstack-workspace" json:"workspacePath"`
+	DiskInfo       string     `json:"diskInfo"` // 如 "45G/200G"
 	Enabled        bool       `gorm:"default:true" json:"enabled"`
 	Status         string     `gorm:"default:offline" json:"status"` // online|offline|busy
 	CurrentJobs    int        `gorm:"default:0" json:"currentJobs"`

frontend/index.html

@@ -3,6 +3,7 @@
   <head>
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
     <title>FlowStack · 发布系统</title>
   </head>
   <body>

frontend/public/favicon.svg

@@ -0,0 +1,15 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64">
+  <defs>
+    <linearGradient id="g" x1="0" y1="0" x2="1" y2="1">
+      <stop offset="0" stop-color="#0969da"/>
+      <stop offset="1" stop-color="#8250df"/>
+    </linearGradient>
+  </defs>
+  <rect x="4" y="4" width="56" height="56" rx="14" fill="url(#g)"/>
+  <g transform="translate(32 33) rotate(45) translate(-11 -13)">
+    <path d="M11 0 C17 4 20 10 20 17 L20 22 L14 22 C8 22 3 19 0 13 L0 0 Z" fill="#fff" opacity="0.95"/>
+    <circle cx="13" cy="9" r="3" fill="#0969da"/>
+    <path d="M0 13 L-6 20 L1 18 Z" fill="#ffd23e"/>
+    <path d="M20 22 L26 28 L19 27 Z" fill="#ffd23e" opacity="0.9"/>
+  </g>
+</svg>

frontend/src/pages/BuildNodeManager.tsx

@@ -10,6 +10,7 @@ import {
   Trash2,
   Tag,
   Zap,
+  HardDrive,
 } from 'lucide-react';
 import { toast } from 'sonner';
 import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
@@ -60,9 +61,10 @@ interface NodeForm {
   labels: string;
   maxConcurrency: string;
   workspacePath: string;
+  diskInfo: string;
 }
 
-const emptyForm: NodeForm = { name: '', ip: '', labels: '', maxConcurrency: '2', workspacePath: '/var/lib/flowstack/workspace' };
+const emptyForm: NodeForm = { name: '', ip: '', labels: '', maxConcurrency: '2', workspacePath: '/var/lib/flowstack/workspace', diskInfo: '' };
 
 const inputStyle = {
   background: 'var(--panel-bg-secondary)',
@@ -92,6 +94,7 @@ export default function BuildNodeManager() {
             labels: parseJsonArray(node.labels).join(','),
             maxConcurrency: String(node.maxConcurrency ?? 2),
             workspacePath: node.workspacePath ?? '',
+            diskInfo: node.diskInfo ?? '',
           }
         : emptyForm,
     );
@@ -152,6 +155,7 @@ export default function BuildNodeManager() {
         labels: JSON.stringify(splitComma(form.labels)),
         maxConcurrency: Number(form.maxConcurrency) || 1,
         workspacePath: form.workspacePath.trim(),
+        diskInfo: form.diskInfo.trim(),
       },
     });
   };
@@ -292,10 +296,16 @@ export default function BuildNodeManager() {
                       </div>
                     </div>
 
-                    {/* Info: 工作空间 / 心跳（后端暂无 CPU/内存/磁盘数据） */}
+                    {/* Info: 磁盘 / 工作空间 / 心跳 */}
-                    <div className="grid grid-cols-2 gap-3 text-[11px]">
+                    <div className="grid grid-cols-3 gap-3 text-[11px]">
                       <div className="flex items-center gap-1.5 min-w-0">
-                        <span className="flex-shrink-0" style={{ color: 'var(--text-tertiary)' }}>工作空间</span>
+                        <HardDrive className="w-3 h-3 flex-shrink-0" style={{ color: 'var(--text-tertiary)' }} />
+                        <span className="font-mono truncate" style={{ color: 'var(--text-secondary)' }} title={node.diskInfo ? `磁盘 ${node.diskInfo}` : '磁盘未上报'}>
+                          {node.diskInfo || '—'}
+                        </span>
+                      </div>
+                      <div className="flex items-center gap-1.5 min-w-0">
+                        <span className="flex-shrink-0" style={{ color: 'var(--text-tertiary)' }}>空间</span>
                         <span className="font-mono truncate" style={{ color: 'var(--text-secondary)' }} title={node.workspacePath}>
                           {node.workspacePath || '—'}
                         </span>
@@ -366,6 +376,10 @@ export default function BuildNodeManager() {
                 <Input className="h-8 text-[12px] font-mono" style={inputStyle} value={form.workspacePath} onChange={(e) => setForm({ ...form, workspacePath: e.target.value })} placeholder="/var/lib/flowstack/workspace" />
               </div>
             </div>
+            <div className="space-y-1.5">
+              <Label className="text-[12px]" style={{ color: 'var(--text-secondary)' }}>磁盘用量</Label>
+              <Input className="h-8 text-[12px] font-mono" style={inputStyle} value={form.diskInfo} onChange={(e) => setForm({ ...form, diskInfo: e.target.value })} placeholder="如 45G/200G（已用/总量）" />
+            </div>
           </div>
           <DialogFooter>
             <button

frontend/src/pages/SystemSettings.tsx

@@ -302,11 +302,41 @@ export default function SystemSettings() {
               <div className="grid grid-cols-2 gap-3">
                 <div><label className="block text-[12px] font-medium mb-1" style={{ color: 'var(--text-secondary)' }}>界面语言</label>
                   <select className="w-full px-3 py-[6px] text-[13px] rounded-md border outline-none" style={{ background: 'var(--panel-bg-secondary)', borderColor: 'var(--border-color-light)', color: 'var(--text-primary)' }}>
-                    <option>简体中文</option><option>English</option><option>日本語</option>
+                    <option>简体中文</option><option>English</option>
                   </select></div>
                 <div><label className="block text-[12px] font-medium mb-1" style={{ color: 'var(--text-secondary)' }}>时区</label>
                   <select className="w-full px-3 py-[6px] text-[13px] rounded-md border outline-none" style={{ background: 'var(--panel-bg-secondary)', borderColor: 'var(--border-color-light)', color: 'var(--text-primary)' }}>
-                    <option>Asia/Shanghai (UTC+8)</option><option>UTC</option><option>America/New_York</option>
+                    <optgroup label="亚洲">
+                      <option>Asia/Shanghai (UTC+8) 中国标准时间</option>
+                      <option>Asia/Hong_Kong (UTC+8) 香港时间</option>
+                      <option>Asia/Taipei (UTC+8) 台北时间</option>
+                      <option>Asia/Singapore (UTC+8) 新加坡时间</option>
+                      <option>Asia/Tokyo (UTC+9) 日本时间</option>
+                      <option>Asia/Seoul (UTC+9) 韩国时间</option>
+                      <option>Asia/Bangkok (UTC+7) 泰国时间</option>
+                      <option>Asia/Dubai (UTC+4) 迪拜时间</option>
+                    </optgroup>
+                    <optgroup label="欧洲">
+                      <option>Europe/London (UTC+0/+1) 英国时间</option>
+                      <option>Europe/Berlin (UTC+1/+2) 中欧时间</option>
+                      <option>Europe/Paris (UTC+1/+2) 法国时间</option>
+                      <option>Europe/Moscow (UTC+3) 莫斯科时间</option>
+                      <option>Europe/Istanbul (UTC+3) 土耳其时间</option>
+                    </optgroup>
+                    <optgroup label="美洲">
+                      <option>America/New_York (UTC-5/-4) 美东时间</option>
+                      <option>America/Chicago (UTC-6/-5) 美中时间</option>
+                      <option>America/Denver (UTC-7/-6) 美山时间</option>
+                      <option>America/Los_Angeles (UTC-8/-7) 美西时间</option>
+                      <option>America/Sao_Paulo (UTC-3) 巴西时间</option>
+                    </optgroup>
+                    <optgroup label="大洋洲 / 非洲 / 标准">
+                      <option>Australia/Sydney (UTC+10/+11) 澳洲东部时间</option>
+                      <option>Australia/Perth (UTC+8) 澳洲西部时间</option>
+                      <option>Africa/Cairo (UTC+2) 埃及时间</option>
+                      <option>Africa/Johannesburg (UTC+2) 南非时间</option>
+                      <option>UTC 协调世界时</option>
+                    </optgroup>
                   </select></div>
               </div>
               <p className="text-[11px]" style={{ color: 'var(--text-tertiary)' }}>语言与时区暂未生效，仅作展示</p>