feat: preserve richer schema clone metadata

[machado144]

Summary

• preserve exact introspected column DDL types, defaults, generated columns, comments, and non-primary indexes during schema clone
• mark generated columns in generated schemas so seed/generate does not insert into computed columns
• expand clone integration fixtures to cover defaults, generated columns, comments, and multi-column indexes on Postgres/MySQL
• document the richer clone coverage and remaining boundaries

Tests

• /home/youngestaxe/go/bin/go1.25.10 test ./...
• cd integration && GOCACHE=/tmp/seedstorm-gocache /home/youngestaxe/go/bin/go1.25.10 test -v -tags integration -count=1 ./... -run 'Test(Postgres|MySQL)SchemaCloneDDL' -timeout 180s

[github-actions]

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