feat(index): implement GIN index support for quoted text columns and enhance index column resolution

pkg/writers/pgsql/migration_writer.go

@@ -604,7 +604,7 @@ func buildIndexColumnExpressions(table *models.Table, index *models.Index, index
 	for _, colName := range index.Columns {
 		colExpr := colName
 		if table != nil {
-			if col, ok := table.Columns[colName]; ok && col != nil {
+			if col, ok := resolveIndexColumn(table, colName); ok && col != nil {
 				colExpr = col.SQLName()
 				if strings.EqualFold(indexType, "gin") && isTextType(col.Type) {
 					opClass := extractOperatorClass(index.Comment)