fix: remove default value from JSON column in migration

[rileychh]

This PR fixes a MySQL error that occurred when running migrations with Docker Compose: BLOB, TEXT, GEOMETRY or JSON column 'keywords' can't have a default value.

Background:
While MySQL 8.0.13+ supports default values for JSON columns when written as expressions (e.g., DEFAULT ('["fxignore"]')), MasoniteORM's .default() method generates SQL without the required parentheses, causing the migration to fail. Moving the default value to the application layer is a cleaner, more portable solution that works across all MySQL versions.

Changes:

• Removed .default("[\"fxignore\"]") from the JSON column definition in the migration
• Made the keywords column nullable instead
• Moved the default value logic to the Guild.find_or_create() method in the model layer

This ensures MySQL compatibility while maintaining the same functional behavior.

This fixes #74

[Kyrela]

This has been fixed by using MariaDB in the docker compose instead of MySQL. MariaDB offers better performance, more features, the image is lighter, and that's what is actually used for development on this project.