refactor: remove unused and legacy code

- remove legacy migrations
- remove unused server code
- remove unused UI code

apps/server/src/utils/parser.ts

@@ -305,7 +305,7 @@ export const parseExcel = (
   };
 };
 
-export type ParsingError = {
+type ParsingError = {
   context: string;
   message: string;
 };