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/util.d.ts

@@ -0,0 +1,21 @@
+import { Block, Tokens, Spec } from './primitives.js';
+export declare function isSpace(source: string): boolean;
+export declare function hasCR(source: string): boolean;
+export declare function splitCR(source: string): [string, string];
+export declare function splitSpace(source: string): [string, string];
+export declare function splitLines(source: string): string[];
+export declare function seedBlock(block?: Partial<Block>): Block;
+export declare function seedSpec(spec?: Partial<Spec>): Spec;
+export declare function seedTokens(tokens?: Partial<Tokens>): Tokens;
+/**
+ * Assures Block.tags[].source contains references to the Block.source items,
+ * using Block.source as a source of truth. This is a counterpart of rewireSpecs
+ * @param block parsed coments block
+ */
+export declare function rewireSource(block: Block): Block;
+/**
+ * Assures Block.source contains references to the Block.tags[].source items,
+ * using Block.tags[].source as a source of truth. This is a counterpart of rewireSource
+ * @param block parsed coments block
+ */
+export declare function rewireSpecs(block: Block): Block;