refactor: fix all lint errors and improve code quality

src/auth.ts

@@ -10,11 +10,19 @@ import bcrypt from 'bcrypt';
 import { env } from '$env/dynamic/private';
 import type { SvelteKitAuthConfig } from '@auth/sveltekit';
 
+interface AuthentikProfile {
+  sub: string;
+  email: string;
+  name?: string;
+  preferred_username?: string;
+  picture?: string;
+}
+
 function Authentik(config: {
   clientId: string;
   clientSecret: string;
   issuer: string;
-}): OAuthConfig<any> {
+}): OAuthConfig<AuthentikProfile> {
   return {
     id: 'authentik',
     name: 'Authentik',