feat(core): 完成 Phase 2 核心功能开发

- 实现查询API (query.py): 支持star_id/unique_id/nickname三种查询方式
- 实现计算模块 (calculator.py): CPM/自然搜索UV/搜索成本计算
- 实现品牌API集成 (brand_api.py): 批量并发调用，10并发限制
- 实现导出服务 (export_service.py): Excel/CSV导出
- 前端组件: QueryForm/ResultTable/ExportButton
- 主页面集成: 支持6种页面状态
- 测试: 44个测试全部通过，覆盖率88%

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

frontend/src/types/index.ts

@@ -0,0 +1,63 @@
+// 查询类型
+export type QueryType = 'star_id' | 'unique_id' | 'nickname';
+
+// 查询请求
+export interface QueryRequest {
+  type: QueryType;
+  values: string[];
+}
+
+// 视频数据
+export interface VideoData {
+  item_id: string;
+  title: string | null;
+  viral_type: string | null;
+  video_url: string | null;
+  star_id: string;
+  star_unique_id: string;
+  star_nickname: string;
+  publish_time: string | null;
+  natural_play_cnt: number;
+  heated_play_cnt: number;
+  total_play_cnt: number;
+  total_interact: number;
+  like_cnt: number;
+  share_cnt: number;
+  comment_cnt: number;
+  new_a3_rate: number | null;
+  after_view_search_uv: number;
+  return_search_cnt: number;
+  industry_id: string | null;
+  industry_name: string | null;
+  brand_id: string | null;
+  brand_name: string | null;
+  estimated_video_cost: number;
+  estimated_natural_cpm: number | null;
+  estimated_natural_search_uv: number | null;
+  estimated_natural_search_cost: number | null;
+}
+
+// 查询响应
+export interface QueryResponse {
+  success: boolean;
+  data: VideoData[];
+  total: number;
+  error?: string;
+}
+
+// 页面状态
+export type PageState = 'default' | 'input' | 'loading' | 'result' | 'empty' | 'error';
+
+// 查询方式选项
+export const QUERY_TYPE_OPTIONS = [
+  { value: 'star_id' as QueryType, label: '星图ID' },
+  { value: 'unique_id' as QueryType, label: '达人unique_id' },
+  { value: 'nickname' as QueryType, label: '达人昵称' },
+];
+
+// 查询方式对应的提示文本
+export const QUERY_PLACEHOLDER: Record<QueryType, string> = {
+  star_id: '请输入星图ID，每行一个...',
+  unique_id: '请输入达人unique_id，每行一个...',
+  nickname: '请输入达人昵称关键词...',
+};