dataconvert: spreadsheets to SQL seeds, layouts from config, row cap, SCHEMA.md

Converts CSV, xlsx/xls/ods, directories, ZIPs and globs into one INSERT
file per table. Producer-specific layouts (header/data rows found by a
marker cell) and sheet naming live in a gitignored dataconvert.json, with
dataconvert-example.json as the template. --max-rows samples each table
and SCHEMA.md records columns, types, row counts and full sizes.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

soleprint/station/tools/dataconvert/pyproject.toml

@@ -0,0 +1,14 @@
+[project]
+name = "dataconvert"
+version = "0.1.0"
+description = "Spreadsheets and CSV into SQL seed files and a schema summary"
+readme = "README.md"
+requires-python = ">=3.11"
+dependencies = [
+    "pandas>=2.2.0",
+    "openpyxl>=3.1.2",
+    "odfpy>=1.4.1",
+]
+
+[tool.uv]
+package = false