feat(web): add api client types (User, LoginResponse, ApiError)

web/src/lib/api/client.ts

@@ -0,0 +1,16 @@
+export type ApiError = {
+  code: string;
+  message: string;
+  status: number;
+};
+
+export type User = {
+  id: string;
+  username: string;
+  is_admin: boolean;
+};
+
+export type LoginResponse = {
+  token: string;
+  user: User;
+};