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/methods/HISTORY.md

@@ -0,0 +1,29 @@
+1.1.2 / 2016-01-17
+==================
+
+  * perf: enable strict mode
+
+1.1.1 / 2014-12-30
+==================
+
+  * Improve `browserify` support
+
+1.1.0 / 2014-07-05
+==================
+
+  * Add `CONNECT` method
+ 
+1.0.1 / 2014-06-02
+==================
+
+  * Fix module to work with harmony transform
+
+1.0.0 / 2014-05-08
+==================
+
+  * Add `PURGE` method
+
+0.1.0 / 2013-10-28
+==================
+
+  * Add `http.METHODS` support