Add optional Nanobot plugin controls (#4396)

* feat: add optional nanobot features

* test: update azure install hint expectation

* fix: validate optional feature extras

maintainer edit: verify requested dependency extras before treating optional features as installed, propagate restart state from feature enablement, and align docs with the new plugins enable command.

* fix: bound optional feature installs

maintainer edit: make optional feature installs time out as a normal install failure instead of leaving the WebUI or CLI action waiting indefinitely.

* feat: slim optional channel dependencies

* fix: log optional install commands

* fix(webui): gate remote feature installs

* docs: clarify webhook plugin example

* fix(webui): harden optional feature installs

* fix: install optional deps without package fallback

* fix(cli): refine plugin feature controls

* fix(webui): count enabled nanobot features

* fix(webui): allow slow feature install routes

* fix(webui): allow disabling websocket channel

* fix(plugins): simplify optional feature controls

* fix(webui): polish apps catalog states

* fix(webui): confirm nanobot support installs

* fix(webui): polish nanobot install dialog

* fix(webui): suppress empty websocket handshakes

* fix(webui): clarify apps plugin summary

* fix(webui): localize workspace access copy

* fix(plugins): polish optional feature controls (#4691)

---------

Co-authored-by: Xubin Ren <52506698+Re-bin@users.noreply.github.com>

webui/src/i18n/locales/zh-CN/common.json

@@ -458,18 +458,36 @@
       "missingCredential": "启用图片生成前请先配置此提供商。"
     },
     "apps": {
-      "description": "添加 nanobot 可在聊天中使用的 App CLI 和 MCP 服务。",
+      "description": "启用插件、本地应用适配器和已连接的工具服务。",
       "cliLabel": "CLI",
       "mcpLabel": "MCP",
+      "channelLabel": "渠道",
+      "featureLabel": "能力",
       "filterAll": "全部",
+      "filterPlugins": "插件",
       "filterCli": "CLI 应用",
       "filterMcp": "MCP 服务",
       "enabledSummary": "已启用 {{count}} 个",
-      "caption": "{{cli}} 个 CLI · {{mcp}} 个 MCP",
+      "caption": "{{plugins}} 个插件 · {{cli}} 个 CLI · {{mcp}} 个 MCP",
       "searchPlaceholder": "搜索应用",
-      "featured": "精选",
+      "featured": "应用目录",
       "loading": "正在加载应用...",
-      "empty": "没有匹配的应用。"
+      "empty": "没有匹配的应用。",
+      "restartRequired": "重启 nanobot 以应用更新后的应用和能力。"
+    },
+    "nanobotFeatures": {
+      "enabled": "已启用",
+      "enable": "启用",
+      "disable": "禁用",
+      "ready": "就绪",
+      "missingDependency": "缺少支持包",
+      "installSupport": "安装支持包",
+      "installConfirmTitle": "安装 {{name}} 支持？",
+      "installConfirmDescription": "将安装并启用 {{name}} 支持。是否继续？",
+      "installConfirmAction": "安装并启用",
+      "websocketRequired": "WebUI 必需",
+      "channelDisabled": "渠道已禁用",
+      "notEnabled": "未启用"
     },
     "automations": {
       "filters": {