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/get-port/index.d.ts

@@ -0,0 +1,64 @@
+/// <reference types="node"/>
+import {ListenOptions} from 'net';
+
+declare namespace getPort {
+	interface Options extends Omit<ListenOptions, 'port'> {
+		/**
+		A preferred port or an iterable of preferred ports to use.
+		*/
+		readonly port?: number | Iterable<number>;
+
+		/**
+		The host on which port resolution should be performed. Can be either an IPv4 or IPv6 address.
+		*/
+		readonly host?: string;
+	}
+}
+
+declare const getPort: {
+	/**
+	Get an available TCP port number.
+
+	@returns Port number.
+
+	@example
+	```
+	import getPort = require('get-port');
+
+	(async () => {
+		console.log(await getPort());
+		//=> 51402
+
+		// Pass in a preferred port
+		console.log(await getPort({port: 3000}));
+		// Will use 3000 if available, otherwise fall back to a random port
+
+		// Pass in an array of preferred ports
+		console.log(await getPort({port: [3000, 3001, 3002]}));
+		// Will use any element in the preferred ports array if available, otherwise fall back to a random port
+	})();
+	```
+	*/
+	(options?: getPort.Options): Promise<number>;
+
+	/**
+	Make a range of ports `from`...`to`.
+
+	@param from - First port of the range. Must be in the range `1024`...`65535`.
+	@param to - Last port of the range. Must be in the range `1024`...`65535` and must be greater than `from`.
+	@returns The ports in the range.
+
+	@example
+	```
+	import getPort = require('get-port');
+
+	(async () => {
+		console.log(await getPort({port: getPort.makeRange(3000, 3100)}));
+		// Will use any port from 3000 to 3100, otherwise fall back to a random port
+	})();
+	```
+	*/
+	makeRange(from: number, to: number): Iterable<number>;
+};
+
+export = getPort;

node_modules/get-port/index.js

@@ -0,0 +1,109 @@
+'use strict';
+const net = require('net');
+
+class Locked extends Error {
+	constructor(port) {
+		super(`${port} is locked`);
+	}
+}
+
+const lockedPorts = {
+	old: new Set(),
+	young: new Set()
+};
+
+// On this interval, the old locked ports are discarded,
+// the young locked ports are moved to old locked ports,
+// and a new young set for locked ports are created.
+const releaseOldLockedPortsIntervalMs = 1000 * 15;
+
+// Lazily create interval on first use
+let interval;
+
+const getAvailablePort = options => new Promise((resolve, reject) => {
+	const server = net.createServer();
+	server.unref();
+	server.on('error', reject);
+	server.listen(options, () => {
+		const {port} = server.address();
+		server.close(() => {
+			resolve(port);
+		});
+	});
+});
+
+const portCheckSequence = function * (ports) {
+	if (ports) {
+		yield * ports;
+	}
+
+	yield 0; // Fall back to 0 if anything else failed
+};
+
+module.exports = async options => {
+	let ports;
+
+	if (options) {
+		ports = typeof options.port === 'number' ? [options.port] : options.port;
+	}
+
+	if (interval === undefined) {
+		interval = setInterval(() => {
+			lockedPorts.old = lockedPorts.young;
+			lockedPorts.young = new Set();
+		}, releaseOldLockedPortsIntervalMs);
+
+		// Does not exist in some environments (Electron, Jest jsdom env, browser, etc).
+		if (interval.unref) {
+			interval.unref();
+		}
+	}
+
+	for (const port of portCheckSequence(ports)) {
+		try {
+			let availablePort = await getAvailablePort({...options, port}); // eslint-disable-line no-await-in-loop
+			while (lockedPorts.old.has(availablePort) || lockedPorts.young.has(availablePort)) {
+				if (port !== 0) {
+					throw new Locked(port);
+				}
+
+				availablePort = await getAvailablePort({...options, port}); // eslint-disable-line no-await-in-loop
+			}
+
+			lockedPorts.young.add(availablePort);
+			return availablePort;
+		} catch (error) {
+			if (!['EADDRINUSE', 'EACCES'].includes(error.code) && !(error instanceof Locked)) {
+				throw error;
+			}
+		}
+	}
+
+	throw new Error('No available ports found');
+};
+
+module.exports.makeRange = (from, to) => {
+	if (!Number.isInteger(from) || !Number.isInteger(to)) {
+		throw new TypeError('`from` and `to` must be integer numbers');
+	}
+
+	if (from < 1024 || from > 65535) {
+		throw new RangeError('`from` must be between 1024 and 65535');
+	}
+
+	if (to < 1024 || to > 65536) {
+		throw new RangeError('`to` must be between 1024 and 65536');
+	}
+
+	if (to < from) {
+		throw new RangeError('`to` must be greater than or equal to `from`');
+	}
+
+	const generator = function * (from, to) {
+		for (let port = from; port <= to; port++) {
+			yield port;
+		}
+	};
+
+	return generator(from, to);
+};

node_modules/get-port/license

@@ -0,0 +1,9 @@
+MIT License
+
+Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

node_modules/get-port/package.json

@@ -0,0 +1,46 @@
+{
+	"name": "get-port",
+	"version": "5.1.1",
+	"description": "Get an available port",
+	"license": "MIT",
+	"repository": "sindresorhus/get-port",
+	"funding": "https://github.com/sponsors/sindresorhus",
+	"author": {
+		"name": "Sindre Sorhus",
+		"email": "sindresorhus@gmail.com",
+		"url": "sindresorhus.com"
+	},
+	"engines": {
+		"node": ">=8"
+	},
+	"scripts": {
+		"test": "xo && ava && tsd"
+	},
+	"files": [
+		"index.js",
+		"index.d.ts"
+	],
+	"keywords": [
+		"port",
+		"find",
+		"finder",
+		"portfinder",
+		"free",
+		"available",
+		"connection",
+		"connect",
+		"open",
+		"net",
+		"tcp",
+		"scan",
+		"random",
+		"preferred",
+		"chosen"
+	],
+	"devDependencies": {
+		"@types/node": "^12.12.21",
+		"ava": "^2.4.0",
+		"tsd": "^0.11.0",
+		"xo": "^0.25.3"
+	}
+}

node_modules/get-port/readme.md

@@ -0,0 +1,109 @@
+# get-port [![Build Status](https://travis-ci.org/sindresorhus/get-port.svg?branch=master)](https://travis-ci.org/sindresorhus/get-port)
+
+> Get an available [TCP port](https://en.wikipedia.org/wiki/Port_(computer_networking))
+
+## Install
+
+```
+$ npm install get-port
+```
+
+## Usage
+
+```js
+const getPort = require('get-port');
+
+(async () => {
+	console.log(await getPort());
+	//=> 51402
+})();
+```
+
+Pass in a preferred port:
+
+```js
+(async () => {
+	console.log(await getPort({port: 3000}));
+	// Will use 3000 if available, otherwise fall back to a random port
+})();
+```
+
+Pass in an array of preferred ports:
+
+```js
+(async () => {
+	console.log(await getPort({port: [3000, 3001, 3002]}));
+	// Will use any element in the preferred ports array if available, otherwise fall back to a random port
+})();
+```
+
+Use the `makeRange()` helper in case you need a port in a certain range:
+
+```js
+(async () => {
+	console.log(await getPort({port: getPort.makeRange(3000, 3100)}));
+	// Will use any port from 3000 to 3100, otherwise fall back to a random port
+})();
+```
+
+## API
+
+### getPort(options?)
+
+Returns a `Promise` for a port number.
+
+#### options
+
+Type: `object`
+
+##### port
+
+Type: `number | Iterable<number>`
+
+A preferred port or an iterable of preferred ports to use.
+
+##### host
+
+Type: `string`
+
+The host on which port resolution should be performed. Can be either an IPv4 or IPv6 address.
+
+### getPort.makeRange(from, to)
+
+Make a range of ports `from`...`to`.
+
+Returns an `Iterable` for ports in the given range.
+
+#### from
+
+Type: `number`
+
+First port of the range. Must be in the range `1024`...`65535`.
+
+#### to
+
+Type: `number`
+
+Last port of the range. Must be in the range `1024`...`65535` and must be greater than `from`.
+
+## Beware
+
+There is a very tiny chance of a race condition if another process starts using the same port number as you in between the time you get the port number and you actually start using it.
+
+Race conditions in the same process are mitigated against by using a lightweight locking mechanism where a port will be held for a minimum of 15 seconds and a maximum of 30 seconds before being released again.
+
+## Related
+
+- [get-port-cli](https://github.com/sindresorhus/get-port-cli) - CLI for this module
+
+---
+
+<div align="center">
+	<b>
+		<a href="https://tidelift.com/subscription/pkg/npm-get-port?utm_source=npm-get-port&utm_medium=referral&utm_campaign=readme">Get professional support for this package with a Tidelift subscription</a>
+	</b>
+	<br>
+	<sub>
+		Tidelift helps make open source sustainable for maintainers while giving companies<br>assurances about security, maintenance, and licensing for their dependencies.
+	</sub>
+</div>