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/comment-parser/lib/parser/index.d.ts

@@ -0,0 +1,11 @@
+import { Block, BlockMarkers } from '../primitives.js';
+import { Tokenizer } from './tokenizers/index.js';
+export interface Options {
+    startLine: number;
+    fence: string;
+    spacing: 'compact' | 'preserve';
+    markers: BlockMarkers;
+    tokenizers: Tokenizer[];
+}
+export type Parser = (source: string) => Block[];
+export default function getParser({ startLine, fence, spacing, markers, tokenizers, }?: Partial<Options>): Parser;