feat: 收视分析后端 API + 前端 service

frontend/src/services/analyticsService.js

@@ -0,0 +1,22 @@
+import http from './http'
+
+/**
+ * 获取收视分析期次数据（含年度目标）
+ * @param {number|null} year - 年份，不传则取最近有数据的年份
+ * @returns {Promise<{year: number, yearly_target: {base_target: number, stretch_target: number}|null, episodes: Array}>}
+ */
+export async function getAnalyticsEpisodes(year) {
+  const params = {}
+  if (year) params.year = year
+  const response = await http.get('/analytics/episodes', { params })
+  return response.data
+}
+
+/**
+ * 获取有收视数据的年份列表（去重降序）
+ * @returns {Promise<number[]>}
+ */
+export async function getAvailableYears() {
+  const response = await http.get('/analytics/years')
+  return response.data
+}