fix(server): fix case-insensitive sort order and add indexes to improve performance (#3425)

* refactor(server): better sort mappings

* refactor(server): simplify GetIndex

* fix: recreate tables and indexes using proper collation

Also add tests to ensure proper collation

* chore: remove unused method

* fix: sort expressions

* fix: lint errors

* fix: cleanup

persistence/radio_repository.go

@@ -24,9 +24,6 @@ func NewRadioRepository(ctx context.Context, db dbx.Builder) model.RadioReposito
 	r.registerModel(&model.Radio{}, map[string]filterFunc{
 		"name": containsFilter("name"),
 	})
-	r.sortMappings = map[string]string{
-		"name": "(name collate nocase), name",
-	}
 	return r
 }