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/es-abstract/2016/tables/typed-array-objects.js

@@ -0,0 +1,32 @@
+'use strict';
+
+// https://262.ecma-international.org/6.0/#table-49
+
+module.exports = {
+	__proto__: null,
+	name: {
+		__proto__: null,
+		$Int8Array: 'Int8',
+		$Uint8Array: 'Uint8',
+		$Uint8ClampedArray: 'Uint8C',
+		$Int16Array: 'Int16',
+		$Uint16Array: 'Uint16',
+		$Int32Array: 'Int32',
+		$Uint32Array: 'Uint32',
+		$Float32Array: 'Float32',
+		$Float64Array: 'Float64'
+	},
+	size: {
+		__proto__: null,
+		$Int8: 1,
+		$Uint8: 1,
+		$Uint8C: 1,
+		$Int16: 2,
+		$Uint16: 2,
+		$Int32: 4,
+		$Uint32: 4,
+		$Float32: 4,
+		$Float64: 8
+	},
+	choices: '"Int8", "Uint8", "Uint8C", "Int16", "Uint16", "Int32", "Uint32", "Float32", or "Float64"'
+};