feat: add hot-pluggable language shell UI system

product-source/hololake-platform/ui-plugins/README.md

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+# HoloLake UI 插件交付入口
+
+这里是 UI 人格体与 HoloLake 功能实现之间的稳定边界。UI 贡献者可以提交完整的语言壳布局、
+视觉变量、文案和素材引用；功能内核仍由 HoloLake 宿主提供。
+
+## 交付步骤
+
+1. 复制 `packages/guanghu.default-language-world/ui-package.json`。
+2. 修改 `manifest.id`、语义化 `version`、`tokens` 和 `layout`。
+3. 保留四个必需表面：`language_input`、`task_status`、
+   `reality_boundary_confirmation`、`human_receipt`。
+4. 只使用三项宿主动作：`goal.submit`、`confirmation.answer`、`evidence.expand`。
+5. 把包加入 `registry.json`，运行：
+   `pnpm exec vitest run src/lib/uiPluginSystem.test.ts src/lib/uiPluginRegistry.test.ts`。
+6. 提交到独立分支并附截图。合并、构建、部署由 HoloLake 功能车道完成。
+
+UI 包是声明式数据，不接受任意 JavaScript。它可以重排整套语言壳并替换全部视觉表达，
+但不能读取节点身份、仓库路由、模型配置、凭据或部署日志，也不能直接执行现实动作。
+
+宿主先校验候选包，再原子切换；校验或渲染失败时保留上一套可用 UI。代码频道发布只证明
+UI 包已登记，不等于桌面制品已经接入或部署。

product-source/hololake-platform/ui-plugins/packages/guanghu.default-language-world/ui-package.json

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+{
+  "manifest": {
+    "schema": "hololake.ui-plugin/v1",
+    "id": "guanghu.default-language-world",
+    "version": "1.0.0",
+    "target": "language_shell",
+    "requestedCapabilities": ["goal.submit", "confirmation.answer", "evidence.expand"]
+  },
+  "tokens": {
+    "--hl-world-background": "#07111f",
+    "--hl-world-foreground": "#f6f1df",
+    "--hl-world-accent": "#d7bd78"
+  },
+  "layout": {
+    "kind": "shell",
+    "children": [
+      {
+        "kind": "stack",
+        "children": [
+          { "kind": "text", "text": "你想让世界发生什么？" },
+          { "kind": "language_input", "action": "goal.submit", "text": "开始" },
+          { "kind": "task_status" },
+          { "kind": "reality_boundary_confirmation", "action": "confirmation.answer", "approveText": "同意继续", "declineText": "暂不继续" },
+          { "kind": "human_receipt" },
+          { "kind": "evidence_toggle", "action": "evidence.expand", "text": "查看依据" }
+        ]
+      }
+    ]
+  }
+}

product-source/hololake-platform/ui-plugins/registry.json

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+{
+  "schema": "hololake.ui-plugin-registry/v1",
+  "plugins": [
+    {
+      "id": "guanghu.default-language-world",
+      "version": "1.0.0",
+      "path": "packages/guanghu.default-language-world/ui-package.json",
+      "state": "REFERENCE_LAST_KNOWN_GOOD"
+    }
+  ]
+}