feat(dashboard): add Plugins page with enable/disable, auth status, install/remove

- New PluginsPage.tsx: full plugin management UI (list, enable/disable,
  install from git, remove, git pull updates, provider picker)
- Backend: dashboard_set_agent_plugin_enabled now also toggles the
  plugin's toolset in platform_toolsets so enabling actually makes
  tools visible in agent sessions
- Backend: /api/dashboard/plugins/hub returns auth_required + auth_command
  per plugin (checks tool registry check_fn)
- Frontend: auth_required shown as Badge + CommandBlock with copy-able
  auth command
- Fix: Select overflow in providers card (min-w-0 grid cells, removed
  truncate/overflow-hidden that clipped dropdown)
- Refactor: _install_plugin_core extracted for non-interactive reuse,
  PluginOperationError for structured error handling
- i18n: en/zh/types updated with all new plugin page strings

web/src/i18n/zh.ts

@@ -75,6 +75,7 @@ export const zh: Translations = {
       logs: "日志",
       models: "模型",
       profiles: "多Agent配置",
+      plugins: "插件管理",
       sessions: "会话",
       skills: "技能",
     },
@@ -83,6 +84,7 @@ export const zh: Translations = {
     navigation: "导航",
     openDocumentation: "在新标签页中打开文档",
     openNavigation: "打开导航",
+    pluginNavSection: "插件",
     sessionsActiveCount: "{count} 个活跃",
     statusOverview: "状态概览",
     system: "系统",
@@ -253,6 +255,44 @@ export const zh: Translations = {
     renamed: "已重命名",
   },
 
+  pluginsPage: {
+    contextEngineLabel: "上下文引擎",
+    dashboardSlots: "面板插槽",
+    disableRuntime: "禁用",
+    enableAfterInstall: "安装后启用",
+    enableRuntime: "启用",
+    forceReinstall: "强制重装（先删除已有目录）",
+    headline: "发现、安装、启用和更新 Hermes 插件（对齐 `hermes plugins` CLI）。",
+    identifierLabel: "Git 地址或 owner/repo",
+    inactive: "未启用",
+    installBtn: "从 Git 安装",
+    installHeading: "从 GitHub / Git 地址安装",
+    installHint: "使用 owner/repo 简写或完整的 https:// / git@ 克隆地址。",
+    memoryProviderLabel: "记忆提供方",
+    missingEnvWarn: "在「密钥」页面设置以下变量后再运行插件：",
+    noDashboardTab: "无仪表盘标签",
+    openTab: "打开",
+    orphanHeading: "仅仪表盘扩展（无匹配的 agent plugin.yaml）",
+    pluginListHeading: "已安装插件",
+    providerDefaults: "内置 / 默认",
+    providersHeading: "运行时提供方插件",
+    providersHint:
+      "写入 config.yaml：memory.provider（留空为内置）、context.engine。下次会话生效。",
+    refreshDashboard: "重新扫描仪表盘扩展",
+    removeConfirm: "从 ~/.hermes/plugins/ 删除此插件？",
+    removeHint: "仅可移除用户安装在 ~/.hermes/plugins 下的插件。",
+    rescanHeading: "SPA 插件注册表",
+    rescanHint: "在磁盘新增文件后扫描，使侧边栏载入新 manifest。",
+    runtimeHeading: "网关运行时（YAML 插件）",
+    saveProviders: "保存提供方设置",
+    savedProviders: "提供方设置已保存。",
+    sourceBadge: "来源",
+    authRequired: "需要认证",
+    authRequiredHint: "运行此命令以完成认证：",
+    updateGit: "git pull",
+    versionBadge: "版本",
+  },
+
   skills: {
     title: "技能",
     searchPlaceholder: "搜索技能和工具集...",