feat(nav): Enhance product API with historical NAV tracking and new charting features

- Updated `ready.py` to include a health check for the new `products_nav_history` endpoint, ensuring system readiness.
- Enhanced the `ProductNavChartPanel` component to visualize historical NAV data with various charting options, including line and column charts.
- Introduced new utility functions for filtering and aggregating NAV data, improving data handling in the frontend.
- Updated tests to verify the inclusion of the new `products_nav_history` check in the API response.
- Improved documentation to reflect recent changes and the new testing baseline of 833 passed tests, indicating enhanced stability.

This update significantly improves the product API by providing access to historical NAV data and enhancing user insights through visualizations.

docs/memory/REQUIREMENTS.md

@@ -60,7 +60,7 @@
 | C-02 | 产品规则咨询 | fin_product RAG + 免责 | **已实现** · Wave1~2 | — |
 | C-03 | 政策/FAQ | fin_policy / fin_faq RAG | **已实现** · Wave1~2 | — |
 | C-04 | 亏损阈值提醒 | `customer_threshold_config` + 持仓查询追加提醒 | **已实现（2026-09-10）** · `threshold_service` | ~~T-40~~ |
-| C-05 | 产品净值 | Core 最新净值快照；禁止实时盘口 | **已实现（2026-09-10）** · Chat `nav_query` · **平台 `GET …/nav/history` + 行情详情页近一年曲线（2026-09-11）** · Chat 仍无历史走势 Tool · Phase B 外部 sync 未做 | ~~T-40~~ |
+| C-05 | 产品净值 | Core 快照；禁止实时盘口 | **已实现** · Chat `nav_query` · 平台 **`nav/history` 详情**（区间 1M~ALL · 日/周 · 走势/涨跌柱/组合 · 时间轴）· Phase B sync 未做 | ~~T-40~~ |
 | C-07 | 风评查询 / 重测引导 | Core L0；重测引导 App/网点 | **部分已实现** · 无 Agent 内问卷 | T-41 |
 | C-08 | 配置目标 | L1 槽 `allocation_target` | **部分已实现** · 无偏离检测/调仓 | T-41 |
 | C-11 | 适当性匹配说明 | 非营销推荐；联动 R-02 | **部分已实现** · 「我能买什么」→ suitability；「推荐稳赚」仍 reject | T-42 |