refactor: server export default (#9)

* refactor: server export default

- Updated various dependencies in pnpm-workspace.yaml to their latest versions, including @nuxt packages, better-auth, and tailwindcss.
- Refactored better-auth configuration in module.ts to call config functions correctly.
- Changed server export in server.ts to use an arrow function for better compatibility.
- Enhanced useAuth function in useAuth.ts to initialize _auth only once and ensure proper function calls for configs.

* fix: correct formatting in default export function

Author: productdevbook

README.md

@@ -212,9 +212,9 @@ Create a `*.better-auth.ts` file to configure server-side auth:
 // server/my-auth.better-auth.ts
 import type { BetterAuthOptions } from 'better-auth'
 
-export default {
+export default () => ({
   // Custom server-side auth configuration
-} satisfies BetterAuthOptions
+} satisfies BetterAuthOptions)
 ```
 
 ### Client Configuration

package.json

@@ -64,5 +64,5 @@
     "vitest": "catalog:",
     "vue-tsc": "catalog:"
   },
-  "packageManager": "pnpm@10.10.0"
+  "packageManager": "pnpm@10.11.0"
 }

playground/server/utils/config.better-auth.ts

@@ -1,7 +1,7 @@
 import type { BetterAuthOptions } from 'better-auth'
 import { admin, openAPI, username } from 'better-auth/plugins'
 
-export default {
+export default () => ({
   emailAndPassword: {
     enabled: true,
   },
@@ -11,4 +11,4 @@ export default {
     username(),
   ],
   trustedOrigins: [],
-} satisfies BetterAuthOptions
+} satisfies BetterAuthOptions)