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/natural-compare/README.md

@@ -0,0 +1,125 @@
+
+[Build]:    http://img.shields.io/travis/litejs/natural-compare-lite.png
+[Coverage]: http://img.shields.io/coveralls/litejs/natural-compare-lite.png
+[1]: https://travis-ci.org/litejs/natural-compare-lite
+[2]: https://coveralls.io/r/litejs/natural-compare-lite
+[npm package]: https://npmjs.org/package/natural-compare-lite
+[GitHub repo]: https://github.com/litejs/natural-compare-lite
+
+
+
+    @version    1.4.0
+    @date       2015-10-26
+    @stability  3 - Stable
+
+
+Natural Compare – [![Build][]][1] [![Coverage][]][2]
+===============
+
+Compare strings containing a mix of letters and numbers
+in the way a human being would in sort order.
+This is described as a "natural ordering".
+
+```text
+Standard sorting:   Natural order sorting:
+    img1.png            img1.png
+    img10.png           img2.png
+    img12.png           img10.png
+    img2.png            img12.png
+```
+
+String.naturalCompare returns a number indicating
+whether a reference string comes before or after or is the same
+as the given string in sort order.
+Use it with builtin sort() function.
+
+
+
+### Installation
+
+- In browser
+
+```html
+<script src=min.natural-compare.js></script>
+```
+
+- In node.js: `npm install natural-compare-lite`
+
+```javascript
+require("natural-compare-lite")
+```
+
+### Usage
+
+```javascript
+// Simple case sensitive example
+var a = ["z1.doc", "z10.doc", "z17.doc", "z2.doc", "z23.doc", "z3.doc"];
+a.sort(String.naturalCompare);
+// ["z1.doc", "z2.doc", "z3.doc", "z10.doc", "z17.doc", "z23.doc"]
+
+// Use wrapper function for case insensitivity
+a.sort(function(a, b){
+  return String.naturalCompare(a.toLowerCase(), b.toLowerCase());
+})
+
+// In most cases we want to sort an array of objects
+var a = [ {"street":"350 5th Ave", "room":"A-1021"}
+        , {"street":"350 5th Ave", "room":"A-21046-b"} ];
+
+// sort by street, then by room
+a.sort(function(a, b){
+  return String.naturalCompare(a.street, b.street) || String.naturalCompare(a.room, b.room);
+})
+
+// When text transformation is needed (eg toLowerCase()),
+// it is best for performance to keep
+// transformed key in that object.
+// There are no need to do text transformation
+// on each comparision when sorting.
+var a = [ {"make":"Audi", "model":"A6"}
+        , {"make":"Kia",  "model":"Rio"} ];
+
+// sort by make, then by model
+a.map(function(car){
+  car.sort_key = (car.make + " " + car.model).toLowerCase();
+})
+a.sort(function(a, b){
+  return String.naturalCompare(a.sort_key, b.sort_key);
+})
+```
+
+- Works well with dates in ISO format eg "Rev 2012-07-26.doc".
+
+
+### Custom alphabet
+
+It is possible to configure a custom alphabet
+to achieve a desired order.
+
+```javascript
+// Estonian alphabet
+String.alphabet = "ABDEFGHIJKLMNOPRSŠZŽTUVÕÄÖÜXYabdefghijklmnoprsšzžtuvõäöüxy"
+["t", "z", "x", "õ"].sort(String.naturalCompare)
+// ["z", "t", "õ", "x"]
+
+// Russian alphabet
+String.alphabet = "АБВГДЕЁЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдеёжзийклмнопрстуфхцчшщъыьэюя"
+["Ё", "А", "Б"].sort(String.naturalCompare)
+// ["А", "Б", "Ё"]
+```
+
+
+External links
+--------------
+
+-   [GitHub repo][https://github.com/litejs/natural-compare-lite]
+-   [jsperf test](http://jsperf.com/natural-sort-2/12)
+
+
+Licence
+-------
+
+Copyright (c) 2012-2015 Lauri Rooden &lt;lauri@rooden.ee&gt;  
+[The MIT License](http://lauri.rooden.ee/mit-license.txt)
+
+