fix: prevent asset conflicts between React and Grid.js versions

Add coexistence checks to all enqueue methods to prevent loading
both React and Grid.js assets simultaneously.

Changes:
- ReactAdmin.php: Only enqueue React assets when ?react=1
- Init.php: Skip Grid.js when React active on admin pages
- Form.php, Coupon.php, Access.php: Restore classic assets when ?react=0
- Customer.php, Product.php, License.php: Add coexistence checks

Now the toggle between Classic and React versions works correctly.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

node_modules/@svgr/plugin-svgo/README.md

@@ -0,0 +1,27 @@
+# @svgr/plugin-svgo
+
+[![Build Status](https://img.shields.io/travis/smooth-code/svgr.svg)](https://travis-ci.org/smooth-code/svgr)
+[![Version](https://img.shields.io/npm/v/@svgr/plugin-svgo.svg)](https://www.npmjs.com/package/@svgr/plugin-svgo)
+[![MIT License](https://img.shields.io/npm/l/@svgr/plugin-svgo.svg)](https://github.com/smooth-code/svgr/blob/master/LICENSE)
+
+Optimize SVG using SVGO.
+
+## Install
+
+```
+npm install --save-dev @svgr/plugin-svgo
+```
+
+## Usage
+
+**.svgrrc**
+
+```json
+{
+  "plugins": ["@svgr/plugin-svgo"]
+}
+```
+
+## License
+
+MIT