* Modify SetCORSHeaders function to include Request parameter.
* Set Access-Control-Allow-Origin and Access-Control-Allow-Headers to "*".
* Update all relevant calls to SetCORSHeaders across the codebase.
Replaced *router.StandardBunRouterAdapter parameter with BunRouterHandler
interface to support both bunrouter.Router and bunrouter.Group types,
enabling route registration on router groups with path prefixes.
- Added BunRouterHandler interface
- Updated SetupBunRouterRoutes signature
- Updated example functions to use bunrouter.New() directly
- Added ExampleBunRouterWithGroup demonstrating group usage
