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/eslint/lib/rules/utils/unicode/index.js

@@ -0,0 +1,11 @@
+/**
+ * @author Toru Nagashima <https://github.com/mysticatea>
+ */
+"use strict";
+
+module.exports = {
+    isCombiningCharacter: require("./is-combining-character"),
+    isEmojiModifier: require("./is-emoji-modifier"),
+    isRegionalIndicatorSymbol: require("./is-regional-indicator-symbol"),
+    isSurrogatePair: require("./is-surrogate-pair")
+};

node_modules/eslint/lib/rules/utils/unicode/is-combining-character.js

@@ -0,0 +1,13 @@
+/**
+ * @author Toru Nagashima <https://github.com/mysticatea>
+ */
+"use strict";
+
+/**
+ * Check whether a given character is a combining mark or not.
+ * @param {number} codePoint The character code to check.
+ * @returns {boolean} `true` if the character belongs to the category, any of `Mc`, `Me`, and `Mn`.
+ */
+module.exports = function isCombiningCharacter(codePoint) {
+    return /^[\p{Mc}\p{Me}\p{Mn}]$/u.test(String.fromCodePoint(codePoint));
+};

node_modules/eslint/lib/rules/utils/unicode/is-emoji-modifier.js

@@ -0,0 +1,13 @@
+/**
+ * @author Toru Nagashima <https://github.com/mysticatea>
+ */
+"use strict";
+
+/**
+ * Check whether a given character is an emoji modifier.
+ * @param {number} code The character code to check.
+ * @returns {boolean} `true` if the character is an emoji modifier.
+ */
+module.exports = function isEmojiModifier(code) {
+    return code >= 0x1F3FB && code <= 0x1F3FF;
+};

node_modules/eslint/lib/rules/utils/unicode/is-regional-indicator-symbol.js

@@ -0,0 +1,13 @@
+/**
+ * @author Toru Nagashima <https://github.com/mysticatea>
+ */
+"use strict";
+
+/**
+ * Check whether a given character is a regional indicator symbol.
+ * @param {number} code The character code to check.
+ * @returns {boolean} `true` if the character is a regional indicator symbol.
+ */
+module.exports = function isRegionalIndicatorSymbol(code) {
+    return code >= 0x1F1E6 && code <= 0x1F1FF;
+};

node_modules/eslint/lib/rules/utils/unicode/is-surrogate-pair.js

@@ -0,0 +1,14 @@
+/**
+ * @author Toru Nagashima <https://github.com/mysticatea>
+ */
+"use strict";
+
+/**
+ * Check whether given two characters are a surrogate pair.
+ * @param {number} lead The code of the lead character.
+ * @param {number} tail The code of the tail character.
+ * @returns {boolean} `true` if the character pair is a surrogate pair.
+ */
+module.exports = function isSurrogatePair(lead, tail) {
+    return lead >= 0xD800 && lead < 0xDC00 && tail >= 0xDC00 && tail < 0xE000;
+};