Refactor: Rename features to modules, update imports and README accordingly

finlog_app/app/README.md

@@ -17,7 +17,7 @@ lib/
     utils/                   → formatters, validators, helpers
     result.dart              → Either/Result type
 
-  features/
+  modules/
     inventory/
       data/
         models/              → DTOs (Json)

finlog_app/app/lib/app/router.dart

@@ -1,4 +1,4 @@
-import 'package:app/features/login/pages/login_page.dart';
+import 'package:app/modules/login/pages/login_page.dart';
 import 'package:app/main.dart';
 import 'package:flutter/material.dart';
 import 'package:go_router/go_router.dart';