feat: 完善代理商端业务逻辑与前后端框架

主要更新：
- 更新代理商端文档，明确项目由品牌方分配流程
- 新增Brief配置详情页(已配置)设计稿
- 完善工作台紧急待办中品牌新任务功能
- 整理Pencil设计文件中代理商端页面顺序
- 新增后端FastAPI框架及核心API
- 新增前端Next.js页面和组件库
- 添加.gitignore排除构建和缓存文件

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/types/auth.ts

@@ -0,0 +1,30 @@
+'use client'
+
+export type UserRole = 'creator' | 'agency' | 'brand'
+
+export interface User {
+  id: string
+  name: string
+  email: string
+  role: UserRole
+  avatar?: string
+  tenantId: string
+  tenantName: string
+}
+
+export interface LoginCredentials {
+  email: string
+  password: string
+}
+
+export interface AuthState {
+  user: User | null
+  isAuthenticated: boolean
+  isLoading: boolean
+}
+
+export interface AuthContextType extends AuthState {
+  login: (credentials: LoginCredentials) => Promise<{ success: boolean; error?: string }>
+  logout: () => void
+  switchRole: (role: UserRole) => void
+}

frontend/types/review.ts

@@ -0,0 +1,75 @@
+/**
+ * 视频审核相关类型定义
+ */
+
+export type TaskStatus = 'pending' | 'processing' | 'completed' | 'failed'
+
+export type RiskLevel = 'high' | 'medium' | 'low'
+
+export type ViolationType =
+  | 'forbidden_word'
+  | 'competitor_logo'
+  | 'duration_short'
+  | 'mention_missing'
+
+export type ViolationSource = 'speech' | 'subtitle' | 'visual'
+
+export interface Violation {
+  id: string
+  type: ViolationType
+  content: string
+  timestamp: number
+  source: ViolationSource
+  riskLevel: RiskLevel
+  suggestion: string
+}
+
+export interface SoftWarning {
+  id: string
+  type: string
+  content: string
+  suggestion: string
+}
+
+export interface ReviewTask {
+  reviewId: string
+  title?: string
+  status: TaskStatus
+  progress?: number
+  currentStep?: string
+  score?: number
+  summary?: string
+  violations?: Violation[]
+  softWarnings?: SoftWarning[]
+  createdAt: string
+  completedAt?: string
+}
+
+export interface VideoReviewRequest {
+  videoUrl?: string
+  platform: string
+  brandId?: string
+  creatorId?: string
+  title?: string
+}
+
+export interface VideoReviewResponse {
+  reviewId: string
+  status: TaskStatus
+}
+
+export interface ReviewProgressResponse {
+  reviewId: string
+  status: TaskStatus
+  progress: number
+  currentStep: string
+}
+
+export interface ReviewResultResponse {
+  reviewId: string
+  status: TaskStatus
+  score: number
+  summary: string
+  violations: Violation[]
+  softWarnings: SoftWarning[]
+}

frontend/types/task.ts

@@ -0,0 +1,36 @@
+export type ApiTaskStatus =
+  | 'pending'
+  | 'processing'
+  | 'completed'
+  | 'failed'
+  | 'approved'
+  | 'rejected'
+
+export interface TaskResponse {
+  task_id: string
+  video_url?: string | null
+  script_content?: string | null
+  script_file_url?: string | null
+  has_script: boolean
+  has_video: boolean
+  platform: string
+  creator_id: string
+  status: ApiTaskStatus
+  created_at: string
+}
+
+export interface TaskListResponse {
+  items: TaskResponse[]
+  total: number
+  page: number
+  page_size: number
+}
+
+export interface TaskScriptUploadRequest {
+  script_content?: string
+  script_file_url?: string
+}
+
+export interface TaskVideoUploadRequest {
+  video_url: string
+}