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/webpack/hot/log-apply-result.js

@@ -0,0 +1,49 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+/**
+ * @param {(string | number)[]} updatedModules updated modules
+ * @param {(string | number)[] | null} renewedModules renewed modules
+ */
+module.exports = function (updatedModules, renewedModules) {
+	var unacceptedModules = updatedModules.filter(function (moduleId) {
+		return renewedModules && renewedModules.indexOf(moduleId) < 0;
+	});
+	var log = require("./log");
+
+	if (unacceptedModules.length > 0) {
+		log(
+			"warning",
+			"[HMR] The following modules couldn't be hot updated: (They would need a full reload!)"
+		);
+		unacceptedModules.forEach(function (moduleId) {
+			log("warning", "[HMR]  - " + moduleId);
+		});
+	}
+
+	if (!renewedModules || renewedModules.length === 0) {
+		log("info", "[HMR] Nothing hot updated.");
+	} else {
+		log("info", "[HMR] Updated modules:");
+		renewedModules.forEach(function (moduleId) {
+			if (typeof moduleId === "string" && moduleId.indexOf("!") !== -1) {
+				var parts = moduleId.split("!");
+				log.groupCollapsed("info", "[HMR]  - " + parts.pop());
+				log("info", "[HMR]  - " + moduleId);
+				log.groupEnd("info");
+			} else {
+				log("info", "[HMR]  - " + moduleId);
+			}
+		});
+		var numberIds = renewedModules.every(function (moduleId) {
+			return typeof moduleId === "number";
+		});
+		if (numberIds)
+			log(
+				"info",
+				'[HMR] Consider using the optimization.moduleIds: "named" for module names.'
+			);
+	}
+};