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/tsconfig-paths/lib/match-path-async.d.ts

@@ -0,0 +1,21 @@
+import * as MappingEntry from "./mapping-entry";
+import * as Filesystem from "./filesystem";
+/**
+ * Function that can match a path async
+ */
+export interface MatchPathAsync {
+    (requestedModule: string, readJson: Filesystem.ReadJsonAsync | undefined, fileExists: Filesystem.FileExistsAsync | undefined, extensions: ReadonlyArray<string> | undefined, callback: MatchPathAsyncCallback): void;
+}
+export interface MatchPathAsyncCallback {
+    (err?: Error, path?: string): void;
+}
+/**
+ * See the sync version for docs.
+ */
+export declare function createMatchPathAsync(absoluteBaseUrl: string, paths: {
+    [key: string]: Array<string>;
+}, mainFields?: string[], addMatchAll?: boolean): MatchPathAsync;
+/**
+ * See the sync version for docs.
+ */
+export declare function matchFromAbsolutePathsAsync(absolutePathMappings: ReadonlyArray<MappingEntry.MappingEntry>, requestedModule: string, readJson: Filesystem.ReadJsonAsync | undefined, fileExists: Filesystem.FileExistsAsync | undefined, extensions: readonly string[] | undefined, callback: MatchPathAsyncCallback, mainFields?: string[]): void;