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/csp_evaluator/package.json

@@ -0,0 +1,28 @@
+{
+  "name": "csp_evaluator",
+  "version": "1.1.1",
+  "description": "Evaluate Content Security Policies for a wide range of bypasses and weaknesses",
+  "main": "dist/evaluator.js",
+  "keywords": [
+    "csp",
+    "content security policy",
+    "content-security-policy",
+    "csp-evaluator"
+  ],
+  "homepage": "https://csp-evaluator.withgoogle.com/",
+  "author": "Lukas Weichselbaum <lwe@google.com>",
+  "license": "Apache-2.0",
+  "prepublish": "tsc",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/google/csp-evaluator"
+  },
+  "scripts": {
+    "test": "tsc && npx jasmine --config=jasmine.json"
+  },
+  "devDependencies": {
+    "@types/jasmine": "^3.6.7",
+    "jasmine": "^3.7.0",
+    "typescript": "^4.2.3"
+  }
+}