feat: AI 自然语言选股（GLM）+ 全市场数据管道 + 远程 PostgreSQL

- 首页双入口（智能选股/策略回测）：引入 vue-router，顶部导航
- 智能选股：自然语言 -> LLM 解析结构化条件（智谱 GLM，OpenAI 兼容，/v4 兼容）-> SQL 快照预筛 + pandas 指标过滤（复用 indicators 单一事实源）
- 条件模型：指标 vs 常数/指标（value_indicator，如 DIF>DEA、close<布林下轨）、lookback+match 表达连续N天/近N天任一天、市值/PE/PB/换手率快照条件、默认排除 ST/退市/北交所
- 全市场数据同步：按 trade_date 批量拉取未复权日线（与回测 candles qfq 隔离），交易日历/股票列表本地缓存，daily_basic 仅最新截面，Tushare 限频兜底（分钟级重试/小时级降级）
- 存储：DATABASE_URL 切远程 PostgreSQL（cirry.cn/stock），本地 SQLite 已移除
- .env 入库（私有仓库）；smoke_test 扩展选股链路

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

backend/uv.lock

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@@ -827,6 +855,7 @@ dependencies = [
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     { name = "fastapi" },
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     { name = "numpy" },
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     { name = "pydantic", specifier = ">=2.7" },