feat(db): support .sql.gz seed files with automatic decompression

[Basavaraj8143]

Summary

This PR adds support for gzipped seed SQL files (.sql.gz) during database seeding.

What’s included

• Auto-detect .sql.gz seed files by extension.
• Decompress gzipped SQL before parsing/executing.
• Reuse the same path for seed hashing so change detection works for compressed seeds.
• Add tests for:
  • pending gzipped seeds
  • seeding from gzipped seed files
  • seeding globals from gzipped files
• Update docs/config comments to mention .sql.gz support.

Why

Large seed files are common in DB-first workflows. Compressed seed files reduce repo/storage size while keeping db reset/seed automation intact.

Backward compatibility

• Existing .sql behavior is unchanged.
• .sql.gz is additive and auto-detected from extension.