fix: Change package name to unscoped for npm publication

- Change from @gupsa-corp/gantt-task-react-19-korean to gantt-task-react-19-korean
- Update README.md import examples to match new package name
- Maintain gupsa-corp repository while using unscoped npm package name

Author: jeonghanyun

README.md

@@ -16,16 +16,16 @@
 ## Install
 
 ```bash
-npm install @gupsa-corp/gantt-task-react-19-korean
+npm install gantt-task-react-19-korean
 # or
-yarn add @gupsa-corp/gantt-task-react-19-korean
+yarn add gantt-task-react-19-korean
 ```
 
 ## How to use it
 
 ```javascript
-import { Gantt, Task, EventOption, StylingOption, ViewMode, DisplayOption } from '@gupsa-corp/gantt-task-react-19-korean';
-import "@gupsa-corp/gantt-task-react-19-korean/dist/index.css";
+import { Gantt, Task, EventOption, StylingOption, ViewMode, DisplayOption } from 'gantt-task-react-19-korean';
+import "gantt-task-react-19-korean/dist/index.css";
 
 let tasks: Task[] = [
     {

package.json

@@ -1,5 +1,5 @@
 {
-  "name": "@gupsa-corp/gantt-task-react-19-korean",
+  "name": "gantt-task-react-19-korean",
   "version": "1.0.0",
   "description": "Interactive Gantt Chart for React with TypeScript - Korean localization support with extra columns and weekend colors.",
   "author": "MaTeMaTuK <maksym.vikarii@gmail.com>",