refactor: migrate authentication from Supabase to Better Auth and update project configuration

apps/backend/src/modules/onboarding/services/onboarding.service.ts

@@ -2,14 +2,12 @@ import { createHash, randomInt } from 'node:crypto';
 import { auth } from '@/lib/auth';
 import { sendMail } from '@/lib/mailer';
 import { db } from '@/lib/prisma';
-import { getSupabaseAdminClient } from '@/lib/supabase-admin';
 import type {
   OnboardingCompleteInput,
   OnboardingResendOtpInput,
   OnboardingStartInput,
   OnboardingVerifyOtpInput,
 } from '@repo/api-contract';
-import type { User as SupabaseAuthUser } from '@supabase/supabase-js';
 import { v7 as uuidv7 } from 'uuid';
 
 const OTP_LENGTH = 6;
@@ -126,77 +124,6 @@ async function sendOtpEmail(email: string, otpCode: string) {
   });
 }
 
-async function findSupabaseUserByEmail(email: string): Promise<SupabaseAuthUser | null> {
-  let page = 1;
-  const perPage = 100;
-
-  while (page <= 10) {
-    const { data, error } = await getSupabaseAdminClient().auth.admin.listUsers({
-      page,
-      perPage,
-    });
-
-    if (error) {
-      throw new Error(`No se pudo consultar usuarios en Supabase: ${error.message}`);
-    }
-
-    const found = data.users.find((user) => user.email?.toLowerCase() === email.toLowerCase());
-
-    if (found) {
-      return found;
-    }
-
-    if (data.users.length < perPage) {
-      return null;
-    }
-
-    page += 1;
-  }
-
-  return null;
-}
-
-async function ensureSupabaseUser(params: {
-  email: string;
-  fullName: string;
-  password: string;
-}): Promise<string> {
-  const existingUser = await findSupabaseUserByEmail(params.email);
-
-  if (existingUser) {
-    const { error } = await getSupabaseAdminClient().auth.admin.updateUserById(existingUser.id, {
-      password: params.password,
-      email_confirm: true,
-      user_metadata: {
-        full_name: params.fullName,
-        name: params.fullName,
-      },
-    });
-
-    if (error) {
-      throw new Error(`No se pudo actualizar usuario existente en Supabase: ${error.message}`);
-    }
-
-    return existingUser.id;
-  }
-
-  const { data, error } = await getSupabaseAdminClient().auth.admin.createUser({
-    email: params.email,
-    password: params.password,
-    email_confirm: true,
-    user_metadata: {
-      full_name: params.fullName,
-      name: params.fullName,
-    },
-  });
-
-  if (error || !data.user) {
-    throw new Error(`No se pudo crear usuario en Supabase: ${error?.message ?? 'unknown error'}`);
-  }
-
-  return data.user.id;
-}
-
 export async function startOnboarding(input: OnboardingStartInput): Promise<StartOnboardingResult> {
   const email = normalizeEmail(input.email);
   const otpCode = createOtpCode();