feat: 港股个股页接入现金流量表（东财域内源 RPT_HKSK_FN_CASHFLOW）#14
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gstock 目前对港股只并入了行情 + 关键财务指标（GMAININDICATOR），
三表里的现金流量表尚未接。本 PR 补上港股现金流量表，仍走同一
东财 datacenter 域内源、复用现有 em_get 限流与 eastmoney_datacenter
封装，不引入任何新数据源/依赖，保持「域内合规子集」定位不变。
- backend/gstock.py：新增 hk_cashflow(query, periods=8)。按 STD_ITEM_CODE
稳定数字码提取经营/投资/筹资/净增加/期初期末 8 项汇总（不依赖东财中文
ITEM_NAME 措辞），按报告期分组、附同比；非港股（美/韩股）返回 {}。
- backend/app.py：新增 GET /api/global/hk/cashflow?symbol=00700。
- backend/chat.py：新增 query_hk_cashflow 工具（system AI + MCP 同步可用）。
- frontend：个股页港股视图下新增「现金流量表」卡（overflow-x 自适应，
最近 5 期，负数标绿）；仅港股渲染，美股 404 静默留空。
- tests/test_live.py：新增 test_hk_cashflow_shape（形状 + 非港股返 {}）。
实测 00700：8 期，经营 +1013.5亿/yoy+31.8%、投资 -105.6亿、筹资 -121.2亿、
期末现金 2177.7亿；AAPL/A股返回 {} / 404。仅客观数据、不含买卖建议。
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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做了什么
gstock 目前对港股只并入了行情 + 关键财务指标（GMAININDICATOR），三表里的现金流量表尚未接。本 PR 补上港股现金流量表，仍走同一东财 datacenter 域内源（
RPT_HKSK_FN_CASHFLOW），复用现有em_get限流与eastmoney_datacenter封装，不引入任何新数据源 / 依赖，保持「域内合规子集」定位不变。改动
hk_cashflow(query, periods=8)。按STD_ITEM_CODE稳定数字码提取 经营 / 投资 / 筹资 / 净增加 / 期初期末 共 8 项汇总（不依赖东财中文ITEM_NAME措辞，避开编码/命名差异），按报告期分组、附同比；非港股（美 / 韩股）返回{}。GET /api/global/hk/cashflow?symbol=00700，错误处理与/api/global/stock一致。query_hk_cashflow工具（system AI 与 MCP server 同步可用，MCP 由chat.TOOLS派生，无需改 mcp_server.py）。api.ts+StockData.tsx）：个股页港股视图下新增「现金流量表」卡片——overflow-x自适应、展示最近 5 期、负数（现金流出）标绿；仅港股渲染，美股返回 404 时静默留空。test_hk_cashflow_shape（形状 + 非港股返回{}）。实测（00700 腾讯控股）
8 期数据，最新期：经营活动现金流净额 +1013.5 亿 / yoy +31.8%、投资 -105.6 亿、筹资 -121.2 亿、期末现金 2177.7 亿（币种 人民币，季度为 YTD 累计）。
AAPL/ A 股代码正确返回{}/ 404。合规
仅客观数据整理，不含买卖建议、不预测、不评分——与现有个股页一致；金额为原生币种。