feat(api): add unified request utility with type definitions

Implement a centralized API request utility with proper TypeScript interfaces
for bid items, AI recommendations, and crawl statistics. The utility handles
base URL configuration, request/response typing, and error handling.

uni-app-version/src/utils/api.ts

@@ -0,0 +1,105 @@
+/**
+ * API 请求封装
+ */
+
+// 从环境变量读取 API 基础地址
+const BASE_URL = import.meta.env.VITE_API_BASE_URL || 'http://localhost:3000'
+
+interface RequestOptions {
+  url: string
+  method?: 'GET' | 'POST' | 'PUT' | 'DELETE'
+  data?: any
+  header?: Record<string, string>
+}
+
+/**
+ * 统一请求方法
+ */
+function request<T = any>(options: RequestOptions): Promise<T> {
+  return new Promise((resolve, reject) => {
+    uni.request({
+      url: BASE_URL + options.url,
+      method: options.method || 'GET',
+      data: options.data || {},
+      header: {
+        'Content-Type': 'application/json',
+        ...options.header
+      },
+      success: (res) => {
+        if (res.statusCode >= 200 && res.statusCode < 300) {
+          resolve(res.data as T)
+        } else {
+          reject(new Error(`请求失败: ${res.statusCode} ${(res.data as any)?.message || ''}`))
+        }
+      },
+      fail: (err) => {
+        console.error('请求错误:', err)
+        reject(new Error(`网络请求失败: ${err.errMsg || '未知错误'}`))
+      }
+    })
+  })
+}
+
+// 数据类型定义
+export interface BidItem {
+  id: string
+  title: string
+  url: string
+  publishDate: string
+  source: string
+  pin: boolean
+  createdAt: string
+  updatedAt: string
+}
+
+export interface AiRecommendation {
+  id: string
+  title: string
+  confidence: number
+  createdAt: string
+}
+
+export interface CrawlInfoStat {
+  source: string
+  count: number
+  latestUpdate: string
+  latestPublishDate: string
+  error: string
+}
+
+/**
+ * 获取置顶投标项目
+ */
+export function getPinnedBids(): Promise<BidItem[]> {
+  return request<BidItem[]>({
+    url: '/api/bids/pinned',
+    method: 'GET'
+  })
+}
+
+/**
+ * 获取 AI 推荐
+ */
+export function getAiRecommendations(): Promise<AiRecommendation[]> {
+  return request<AiRecommendation[]>({
+    url: '/api/ai/latest-recommendations',
+    method: 'GET'
+  })
+}
+
+/**
+ * 获取爬虫统计信息
+ */
+export function getCrawlInfoStats(): Promise<CrawlInfoStat[]> {
+  return request<CrawlInfoStat[]>({
+    url: '/api/bids/crawl-info-stats',
+    method: 'GET'
+  })
+}
+
+export default {
+  request,
+  getPinnedBids,
+  getAiRecommendations,
+  getCrawlInfoStats
+}