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/word-wrap/index.d.ts

@@ -0,0 +1,50 @@
+/**
+ * Wrap words to a specified length.
+ */
+export = wrap;
+
+declare function wrap(str: string, options?: wrap.IOptions): string;
+
+declare namespace wrap {
+    export interface IOptions {
+
+        /**
+         * The width of the text before wrapping to a new line.
+         * @default ´50´
+         */
+        width?: number;
+
+        /**
+         * The string to use at the beginning of each line.
+         * @default ´  ´ (two spaces)
+         */
+        indent?: string;
+
+        /**
+         * The string to use at the end of each line.
+         * @default ´\n´
+         */
+        newline?: string;
+
+        /**
+         * An escape function to run on each line after splitting them.
+         * @default (str: string) => string;
+         */
+        escape?: (str: string) => string;
+
+        /**
+         * Trim trailing whitespace from the returned string.
+         * This option is included since .trim() would also strip
+         * the leading indentation from the first line.
+         * @default true
+         */
+        trim?: boolean;
+
+        /**
+         * Break a word between any two letters when the word is longer
+         * than the specified width.
+         * @default false
+         */
+        cut?: boolean;
+    }
+}