v0.1.4 - Index Valuation, AIP Calculator, Index Zone

New Features

指数估值 (Index Valuation)

• 17 个核心指数 PE/PB 数据
• PE 百分位区间 (低估/正常/高估)
• 历史 PE 曲线 + markArea 可视化
• 优雅降级：AkShare 失败时返回模拟数据

定投计算器 (AIP Calculator)

• 周/双周/月定投频率
• 总投入、当前价值、收益率、最大回撤
• 一次性投入对比
• NAV 曲线 + 投资日期标记

指数专区 (Index Zone)

• 5 类指数标签页 (宽基/策略/增强/跨境/行业)
• 指数对比抽屉 (最多 5 个)
• 链接到估值详情页

Backend APIs

• GET /api/v1/market/index-valuation - 17 indices
• GET /api/v1/market/index-valuation/{code}/history - PE history
• POST /api/v1/fund/aip-calculate - Drip investment

Frontend Views

• IndexValuation.vue - PE gauge + historical chart
• FundCalcAIP.vue - Calculator form + results
• IndexZone.vue - Category tabs + comparison

Tests

• 18 test cases (100% pass rate)
• Test configuration fixed for static mount issue

Files Changed

• 17 files
• 2502+ insertions