fix: resolve ESLint errors and warnings

- Add emoji accessibility labels (jsx-a11y/accessible-emoji)
- Remove unused imports and variables
- Fix async functions without await
- Add dev directory to ESLint ignore list
- Add eslint-disable comment for necessary console.error
- Clean up unused route file

All ESLint errors resolved (0 errors, 33 warnings remaining)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/plugin/config.ts

@@ -1,6 +1,6 @@
-import { CollectionConfig } from 'payload'
-import { FieldsOverride } from './utils'
-import { PaymentProvider } from './types/index'
+import type { CollectionConfig } from 'payload'
+import type { FieldsOverride } from './utils'
+import type { PaymentProvider } from './types/index'
 
 export const defaults = {
   paymentsCollection: 'payments',