feat: 股本/上市日期入库 + 换手率支持（closes #1） - #46
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- stock_info 新增 zgb/ltag（万股）、capital_date/list_date， 来自 base.dbf（ZGB/LTAG/GXRQ/SSDATE），缺失/不可读降级 NULL - 换手率(%) = daily_data.volume / stock_info.ltag（手 与 万股 单位差恰好抵消；实测平安 0.547%/茅台 0.328% 与行情软件同量级） - save_stock_info 改单事务快照替换（append 重跑撞 code 唯一约束） - parse_base_dbf 通用化（按列名取值），parse_base_dbf_dy 改为薄封装 - blocks 四链文件读取统一补缺失/不可读降级（#44 同款场景） - 迁移脚本 migrate_stock_info_capital.sql；测试 +4（含目录冒充文件 触发 OSError 的跨平台降级测试） Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
- blocks 链的格式异常（如 base.dbf 缺列）改为单链降级， 不再传播丢弃已收集的其他链结果 - 测试 +2：缺列 DBF 仅地区链降级 / save_stock_info 快照替换与失败回滚 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Summary
issue #1（换手率）的内置方案：股本数据入库，消费端一个 JOIN 算换手率；上市日期一并入库支持次新股过滤。
Related Issue
Closes #45
Closes #1
What Changed
stock_info+4 列：zgb/ltag（万股）、capital_date/list_date，来自本地base.dbf（盘后自动更新；单位已用平安 194.06 亿股、茅台 12.5 亿股核准）换手率(%) = daily_data.volume / stock_info.ltag——volume（手）与 ltag（万股）的单位差恰好抵消。实测 7/6：平安 0.547%、茅台 0.328%，与行情软件同量级save_stock_info改单事务快照替换（原 append 语义重跑撞 code 唯一约束，股本刷新需要可重跑）parse_base_dbf通用化按列取值；blocks 四链统一补"存在但不可读"降级（fix: infoharbor_ex.code 存在但不可读时回退占位符，不中断同步 #44 的 SMB 锁定场景，此前 blocks 只兜了缺失）migrate_stock_info_capital.sql（ALTER ×4，三库通用）Done Criteria Mapping
Risks / Tradeoffs
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