feat(migrations): add display_name column to models table

- Introduced a new column `display_name` to the `models` table for optional user-facing display names.
- Created migration scripts for both adding and removing the column, ensuring backward compatibility.

migrations/versioned/000057_models_display_name.up.sql

@@ -1,10 +1,10 @@
--- Migration: 000056_models_display_name
+-- Migration: 000057_models_display_name
 -- Add an optional user-facing display name for model rows. Runtime model
 -- calls continue to use models.name; this field is presentation-only.
 
-DO $$ BEGIN RAISE NOTICE '[Migration 000056] Adding models.display_name column'; END $$;
+DO $$ BEGIN RAISE NOTICE '[Migration 000057] Adding models.display_name column'; END $$;
 
 ALTER TABLE models
     ADD COLUMN IF NOT EXISTS display_name VARCHAR(255) NOT NULL DEFAULT '';
 
-DO $$ BEGIN RAISE NOTICE '[Migration 000056] Done'; END $$;
+DO $$ BEGIN RAISE NOTICE '[Migration 000057] Done'; END $$;