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/basic-ftp/dist/netUtils.d.ts

@@ -0,0 +1,21 @@
+import { Socket } from "net";
+import { ConnectionOptions, TLSSocket } from "tls";
+/**
+ * Returns a string describing the encryption on a given socket instance.
+ */
+export declare function describeTLS(socket: Socket | TLSSocket): string;
+/**
+ * Returns a string describing the remote address of a socket.
+ */
+export declare function describeAddress(socket: Socket): string;
+/**
+ * Upgrade a socket connection with TLS.
+ */
+export declare function upgradeSocket(socket: Socket, options: ConnectionOptions): Promise<TLSSocket>;
+/**
+ * Returns true if an IP is a private address according to https://tools.ietf.org/html/rfc1918#section-3.
+ * This will handle IPv4-mapped IPv6 addresses correctly but return false for all other IPv6 addresses.
+ *
+ * @param ip  The IP as a string, e.g. "192.168.0.1"
+ */
+export declare function ipIsPrivateV4Address(ip?: string): boolean;