feat: 品牌统一 LokiStack + 全站中英 i18n + 用户批量删除 + 主题定时切换与浅色侧栏

- 品牌: Go 模块/数据文件/二进制/构建部署资产全部 opsx→lokistack;前端 localStorage 命名空间迁移(读旧写新,含按用户 id 前缀迁移);修复 nginx upstream 与 Makefile 引用已改名服务的断裂
- i18n: react-i18next 落地,common + 11 个页面域命名空间全站中英(菜单/顶栏/登录/列表页/表单/确认弹窗/状态徽章);设置页语言即时切换;修复词典自注册导致的循环导入白屏
- 用户管理: 批量删除(POST /users/batch-delete,不删自己/最后管理员,部分失败不阻断)+ 行复选/全选/批量工具条
- 主题: 浅色侧栏(中性灰激活态)、四态模式(浅色/深色/跟随系统/定时切换,按时区判定)、顶栏太阳月亮二态、设置页紧凑分段选择器
- UI: 登录记住用户名、CardActionButton 统一五页卡片操作钮、shadcn Badge 替换手写徽章、语义色修正
- 清理: 移除主机 Web 终端(前后端)、k8s-helm/Helm 遗留代码与字段、README 重写精简
- 修复: 侧栏与日志告警 order 重复、路由标题 i18n key 未翻译、词典双逗号等

frontend/src/i18n/locales/en/hosts.ts

@@ -0,0 +1,81 @@
+// hosts namespace — host management page (English)
+export default {
+  title: 'Hosts',
+  description: 'Manage SSH hosts for binary-based Loki deployment',
+  actions: {
+    add: 'Add Host',
+    detail: 'Details',
+    editAria: 'Edit host {{name}}',
+    validateAria: 'Validate host {{name}}',
+    deleteAria: 'Delete host {{name}}',
+  },
+  fields: {
+    address: 'Address',
+    user: 'User',
+    auth: 'Auth',
+    authPassword: 'Password',
+    authKey: 'SSH Key',
+    os: 'OS',
+    unknown: 'Unknown',
+  },
+  empty: {
+    title: 'No hosts yet',
+    description: 'Add your first SSH host to get started',
+  },
+  delete: {
+    warning:
+      'Delete "{{name}}"? Warning: {{dep}} deployments and {{col}} collector policies still reference this host; they will stop working once it is deleted.',
+  },
+  toast: {
+    deleteFailed: 'Failed to delete host',
+    validateFailed: 'Validation failed',
+    createFailed: 'Failed to add host',
+  },
+  form: {
+    addTitle: 'Add SSH Host',
+    editTitle: 'Edit Host',
+    editTitleWithName: 'Edit Host · {{name}}',
+    nameLabel: 'Name *',
+    hostIpLabel: 'Host IP *',
+    portLabel: 'Port',
+    userLabel: 'Username *',
+    authTypeLabel: 'Authentication',
+    passwordLabel: 'Password *',
+    passwordLabelEdit: 'Password (leave blank to keep unchanged)',
+    passwordPlaceholder: 'SSH login password',
+    privateKeyLabel: 'Private Key *',
+    privateKeyLabelEdit: 'Private Key (leave blank to keep unchanged)',
+    keyPhraseLabel: 'Passphrase (optional)',
+    keyPhrasePlaceholder: 'Leave blank if no passphrase',
+    labelsLabel: 'Labels (JSON)',
+    submitAdd: 'Add Host',
+    submitSave: 'Save Changes',
+    submittingAdd: 'Adding...',
+    submittingSave: 'Saving...',
+    validation: {
+      nameRequired: 'Host name is required',
+      hostIpRequired: 'Host IP is required',
+      portRequired: 'Port is required',
+      portNumeric: 'Port must be a number',
+      portRange: 'Port must be between 1 and 65535',
+      userRequired: 'Username is required',
+      passwordRequired: 'SSH password is required',
+      privateKeyRequired: 'Paste the SSH private key content',
+    },
+  },
+  detail: {
+    loadError: 'Failed to load host details',
+    usage: 'Resource Usage',
+    memory: 'Memory',
+    disk: 'Disk',
+    usageDetail: '({{detail}})',
+    basicInfo: 'Basic Info',
+    hostname: 'Hostname',
+    os: 'OS',
+    arch: 'Architecture',
+    kernel: 'Kernel',
+    cpuCores: 'CPU Cores',
+    uptime: 'Uptime',
+    unknown: 'Unknown',
+  },
+}