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/intl-messageformat-parser/index.d.ts

@@ -0,0 +1,63 @@
+export type Selector = string
+export interface LocationDetails {
+    offset: number
+    line: number
+    column: number
+}
+export interface Location {
+    start: LocationDetails, 
+    end: LocationDetails
+}
+export interface SimpleFormat {
+    type: 'numberFormat' | 'dateFormat' | 'timeFormat'
+    style: string
+    location: Location
+}
+export interface PluralFormat extends PluralStyle {
+    ordinal: false
+}
+export interface SelectFormat {
+    type: 'selectFormat'
+    options: OptionalFormatPattern[],
+    location: Location
+}
+export interface SelectOrdinalFormat extends PluralStyle {
+    ordinal: true,
+}
+export type ElementFormat = SimpleFormat | PluralFormat | SelectOrdinalFormat | SelectFormat
+export interface OptionalFormatPattern {
+    type: 'optionalFormatPattern',
+    selector: Selector
+    value: MessageFormatPattern
+    location: Location
+}
+export interface PluralStyle {
+    type: 'pluralFormat',
+    offset: number
+    options: OptionalFormatPattern[],
+    location: Location
+}
+export interface MessageTextElement {
+    type: 'messageTextElement'
+    value: string
+    location: Location
+}
+export interface ArgumentElement {
+    type: 'argumentElement'
+    id: string
+    format: ElementFormat
+    location: Location 
+}
+export type Element = MessageTextElement | ArgumentElement
+
+export interface MessageFormatPattern {
+    type: 'messageFormatPattern',
+    elements: Array<Element>,
+    location: Location
+}
+interface Parser {
+    parse (msg: string): MessageFormatPattern
+    SyntaxError: Error
+}
+declare const parser: Parser
+export default parser