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/@babel/eslint-parser/lib/convert/convertComments.cjs.map

@@ -0,0 +1 @@
+{"version":3,"names":["convertComments","comments","comment","type","range","start","end"],"sources":["../../src/convert/convertComments.cts"],"sourcesContent":["import type { Comment } from \"@babel/types\";\n\nexport = function convertComments(comments: Comment[]) {\n  for (const comment of comments) {\n    // @ts-expect-error eslint\n    comment.type = comment.type === \"CommentBlock\" ? \"Block\" : \"Line\";\n\n    // sometimes comments don't get ranges computed,\n    // even with options.ranges === true\n\n    // @ts-expect-error eslint\n    comment.range ||= [comment.start, comment.end];\n  }\n};\n"],"mappings":";;iBAES,SAASA,eAAeA,CAACC,QAAmB,EAAE;EACrD,KAAK,MAAMC,OAAO,IAAID,QAAQ,EAAE;IAE9BC,OAAO,CAACC,IAAI,GAAGD,OAAO,CAACC,IAAI,KAAK,cAAc,GAAG,OAAO,GAAG,MAAM;IAMjED,OAAO,CAACE,KAAK,KAAbF,OAAO,CAACE,KAAK,GAAK,CAACF,OAAO,CAACG,KAAK,EAAEH,OAAO,CAACI,GAAG,CAAC;EAChD;AACF,CAAC","ignoreList":[]}