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/app/(app)/tasks/page.tsx

@@ -5,7 +5,7 @@ import { useSearchParams } from 'next/navigation';
 import React, { useEffect, useMemo, useState } from 'react';
 import { AlertCircle, ArrowRight, Clock3, FolderDown, ListTodo, Loader2, Play, Plus, RefreshCw, Trash2, X } from 'lucide-react';
 
-import { formatOfficeTime } from '@/components/office/OfficeShared';
+import { formatTaskRuntimeTime } from '@/components/task-runtime/TaskRuntimeShared';
 import { TaskManagementTabs } from '@/components/task-management/TaskManagementTabs';
 import { Badge } from '@/components/ui/badge';
 import { Button } from '@/components/ui/button';
@@ -151,7 +151,7 @@ function OrdinaryTasks() {
                 </TableCell>
                 <TableCell className="text-sm text-muted-foreground">{task.run_ids.length}</TableCell>
                 <TableCell className="text-sm text-muted-foreground">{task.skill_names.length}</TableCell>
-                <TableCell className="text-xs text-muted-foreground">{formatOfficeTime(task.updated_at, locale)}</TableCell>
+                <TableCell className="text-xs text-muted-foreground">{formatTaskRuntimeTime(task.updated_at, locale)}</TableCell>
                 <TableCell>
                   <div className="flex items-center gap-1">
                     <Button asChild size="sm" variant="outline">