feat: add /api/user/me endpoint for session restoration

cmd/server/main.go

@@ -91,6 +91,7 @@ func main() {
 
 		r.Route("/api/user", func(r chi.Router) {
 			r.Post("/skin", profileHandler.UploadSkin)
+			r.Get("/me", userHandler.GetMe)
 		})
 
 		r.Route("/api/admin", func(r chi.Router) {