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[M1][阶段二][B3] 后端:元数据解析 + Excel/CSV 上传 #52

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@xlorne

POST /api/datasources/{id}/introspect:DB→JDBC DatabaseMetaData/ResultSetMetaData 表+字段;EXCEL→每 sheet 一个 TableDataset;CSV→单 TableDataset(均首行列名,类型默认 STRING)。POST /api/datasources/upload(EXCEL/CSV)落 excel.dir/csv.dir 并解析。

依赖:A0,B1,B2。§3.2

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