Fix ES module __dirname error in payload config

Resolves: ReferenceError: __dirname is not defined in ES module scope
- Import fileURLToPath from 'url' module
- Create __filename and __dirname using ES module pattern
- Maintains compatibility with TypeScript output file path resolution

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

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

payload.config.ts

@@ -0,0 +1,28 @@
+
+import { BaseDatabaseAdapter, buildConfig, Payload} from 'payload'
+import Emails from "./src/collections/Emails.js"
+import {createEmailTemplatesCollection} from "./src/collections/EmailTemplates.js"
+import path from "path"
+import { fileURLToPath } from 'url'
+
+const __filename = fileURLToPath(import.meta.url)
+const __dirname = path.dirname(__filename)
+
+export default buildConfig({
+  collections: [
+    Emails,
+    createEmailTemplatesCollection()
+  ],
+  db: {
+    allowIDOnCreate: undefined,
+    defaultIDType: 'number',
+    init: function (args: { payload: Payload; }): BaseDatabaseAdapter {
+      throw new Error('Function not implemented.');
+    },
+    name: undefined
+  },
+  secret: '',
+  typescript: {
+    outputFile: path.resolve(__dirname, 'src/payload-types.ts'),
+  }
+});