refactor(beaver): 移除Hermes相关引用和迁移代码，完善Beaver后端主线实现

移除了所有Hermes相关的命名引用，包括：
- 从.gitignore中清理相关构建缓存文件
- 将README中的beaver-home路径配置更新
- 完善backend/README.md文档说明Beaver后端主线实现
- 移除Hermes风格的相关注释和兼容性代码
- 清理nanobot环境变量兼容性处理
- 删除技能迁移和服务迁移相关功能代码
- 更新测试用例中相关命名和函数名

BREAKING CHANGE: 移除了Hermes迁移相关API和CLI命令，不再支持nanobot环境变量兼容性

app-instance/frontend/lib/i18n/common.ts

@@ -1,10 +1,10 @@
-import type { OfficeTaskStatus } from '@/lib/office';
+import type { TaskRuntimeStatus } from '@/lib/task-runtime';
 import type { ProcessArtifact, ProcessRun } from '@/types';
 import { getCurrentAppLocale, pickAppText, type AppLocale } from '@/lib/i18n/core';
 import type { WsStatus } from '@/lib/api';
 
 export function appStatusLabel(
-  status: ProcessRun['status'] | OfficeTaskStatus | string,
+  status: ProcessRun['status'] | TaskRuntimeStatus | string,
   locale: AppLocale = getCurrentAppLocale()
 ): string {
   if (status === 'queued') return pickAppText(locale, '排队中', 'Queued');
@@ -63,12 +63,12 @@ export function appArtifactPreview(artifact: ProcessArtifact, locale: AppLocale
 
 export function appConnectionStatusLabel(
   wsStatus: WsStatus,
-  nanobotReady: boolean | null,
+  beaverReady: boolean | null,
   locale: AppLocale = getCurrentAppLocale()
 ): string {
-  const isOnline = wsStatus === 'connected' && nanobotReady === true;
-  const isChecking = wsStatus === 'connected' && nanobotReady === null;
-  const isOffline = wsStatus === 'disconnected' || (wsStatus === 'connected' && nanobotReady === false);
+  const isOnline = wsStatus === 'connected' && beaverReady === true;
+  const isChecking = wsStatus === 'connected' && beaverReady === null;
+  const isOffline = wsStatus === 'disconnected' || (wsStatus === 'connected' && beaverReady === false);
 
   if (isOnline) return pickAppText(locale, '已连接', 'Connected');
   if (isChecking) return pickAppText(locale, '检查中', 'Checking');

app-instance/frontend/lib/i18n/core.ts

@@ -1,5 +1,5 @@
-export const APP_LOCALE_COOKIE = 'nanobot_locale';
-export const APP_LOCALE_STORAGE_KEY = 'nanobot_locale';
+export const APP_LOCALE_COOKIE = 'beaver_locale';
+export const APP_LOCALE_STORAGE_KEY = 'beaver_locale';
 
 export const APP_LOCALES = ['zh-CN', 'en-US'] as const;