Phase 27 Part A (1/3): 代码冗余清理 - 消除重复函数和废弃类型

清理了重复定义的工具函数和废弃的类型定义，统一使用utils/format.ts中的标准化函数。

## 清理内容:

### 1. 消除重复的formatBytes函数
**问题**: Dashboard.tsx和AdminDashboard.tsx中重复定义了formatBytes函数
**解决方案**:
- 删除本地formatBytes定义
- 统一使用utils/format.ts中的formatFileSize函数
- 更新所有使用点

**修改文件**:
- frontend/src/pages/dashboard/Dashboard.tsx
  - 添加导入: formatFileSize from '@/utils/format'
  - 删除lines 48-56: formatBytes函数定义
  - 替换line 160: formatBytes() → formatFileSize()

- frontend/src/pages/admin/AdminDashboard.tsx
  - 添加导入: formatFileSize from '../../utils/format'
  - 删除lines 138-141: formatBytes函数定义
  - 替换line 174: formatBytes() → formatFileSize()
  - 替换line 299: formatBytes() → formatFileSize()

### 2. 删除废弃的类型定义
**问题**: ProjectListResponse和TaskListResponse标记为@deprecated但未清理
**解决方案**: 删除废弃类型和未使用的导入

**修改文件**:
- frontend/src/types/project.ts
  - 删除: ProjectListResponse type (lines 33-37)
  - 删除: PaginatedResponse导入（已无使用）

- frontend/src/types/task.ts
  - 删除: TaskListResponse type (lines 46-49)
  - 删除: PaginatedResponse导入（已无使用）

## 收益:
- ✅ 减少代码重复: 删除2个重复函数定义
- ✅ 代码更简洁: 删除2个废弃类型和2个未使用导入
- ✅ 统一格式化: 所有文件大小格式化使用相同函数
- ✅ 更好的维护性: 单一真实来源(Single Source of Truth)

## 验证:
- ✅ TypeScript编译: 0错误
- ✅ 前端构建成功
- ✅ Bundle大小: 213.99 KB (main chunk)

Author: claude

frontend/src/pages/admin/AdminDashboard.tsx

@@ -43,6 +43,7 @@ import {
   EnhancedEmptyState,
 } from '../../components/common'
 import { toast } from '../../utils/notification'
+import { formatFileSize } from '../../utils/format'
 import type { StatisticItem } from '../../components/common'
 import type { User, UserAdminUpdate, SystemStats } from '../../types/admin'
 import dayjs from 'dayjs'
@@ -134,11 +135,6 @@ export const AdminDashboard: React.FC = () => {
     }
   }
 
-  const formatBytes = (bytes: number) => {
-    const gb = bytes / (1024 * 1024 * 1024)
-    return `${gb.toFixed(2)} GB`
-  }
-
   const columns: ColumnsType<User> = [
     {
       title: 'Username',
@@ -175,7 +171,7 @@ export const AdminDashboard: React.FC = () => {
           <div>
             <Progress percent={Math.round(percent)} size="small" status={percent > 90 ? 'exception' : 'normal'} />
             <div style={{ fontSize: 12, color: '#666' }}>
-              {formatBytes(record?.storage_used ?? 0)} / {formatBytes(record?.storage_quota ?? 0)}
+              {formatFileSize(record?.storage_used ?? 0)} / {formatFileSize(record?.storage_quota ?? 0)}
             </div>
           </div>
         )
@@ -300,7 +296,7 @@ export const AdminDashboard: React.FC = () => {
             status="active"
           />
           <div style={{ marginTop: 8, fontSize: 14 }}>
-            {formatBytes(stats?.total_storage_used || 0)} / {formatBytes(stats?.total_storage_quota || 0)}
+            {formatFileSize(stats?.total_storage_used || 0)} / {formatFileSize(stats?.total_storage_quota || 0)}
           </div>
         </Card>
       </FadeIn>

frontend/src/pages/dashboard/Dashboard.tsx

@@ -14,6 +14,7 @@ import { authStore } from '@/store/authStore'
 import { PageSkeleton, FadeIn, StaggeredList, EnhancedEmptyState } from '@/components/common'
 import { useAsync } from '@/hooks'
 import { statsService } from '@/services/stats.service'
+import { formatFileSize } from '@/utils/format'
 import styles from './Dashboard.module.css'
 
 const { Title, Text } = Typography
@@ -45,16 +46,6 @@ export const Dashboard: React.FC = () => {
 
   const storagePercent = stats ? Math.round((stats.storageUsed / stats.storageQuota) * 100) : 0
 
-  const formatBytes = (bytes: number) => {
-    if (bytes === 0) {
-      return '0 Bytes'
-    }
-    const k = 1024
-    const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB']
-    const i = Math.floor(Math.log(bytes) / Math.log(k))
-    return Math.round((bytes / Math.pow(k, i)) * 100) / 100 + ' ' + sizes[i]
-  }
-
   // Loading 状态 - Use PageSkeleton
   if (loading) {
     return <PageSkeleton hasHeader rows={4} />
@@ -166,7 +157,7 @@ export const Dashboard: React.FC = () => {
                   size="small"
                 />
                 <Text type="secondary" style={{ fontSize: 12, marginTop: 4, display: 'block' }}>
-                  {formatBytes(stats.storageUsed)} / {formatBytes(stats.storageQuota)}
+                  {formatFileSize(stats.storageUsed)} / {formatFileSize(stats.storageQuota)}
                 </Text>
               </div>
             </Card>

frontend/src/types/project.ts

@@ -2,8 +2,6 @@
  * Project types and interfaces
  */
 
-import type { PaginatedResponse } from './common'
-
 export interface Project {
   id: string
   name: string
@@ -30,12 +28,6 @@ export interface ProjectUpdate {
   config?: Record<string, any>
 }
 
-/**
- * @deprecated Use PaginatedResponse<Project> instead
- * Kept for backward compatibility during migration
- */
-export type ProjectListResponse = PaginatedResponse<Project>
-
 export interface ProjectStats {
   total_projects: number
   active_projects: number

frontend/src/types/task.ts

@@ -2,8 +2,6 @@
  * Task types and interfaces
  */
 
-import type { PaginatedResponse } from './common'
-
 export type TaskStatus = 'pending' | 'running' | 'completed' | 'failed' | 'cancelled'
 
 export interface Task {
@@ -43,11 +41,6 @@ export interface TaskExecuteRequest {
   config?: Record<string, any>
 }
 
-/**
- * @deprecated Use PaginatedResponse<Task> instead
- */
-export type TaskListResponse = PaginatedResponse<Task>
-
 export interface TaskStats {
   total_tasks: number
   pending_tasks: number