refactor: integrate Better-Auth for authentication and remove Supabase dependencies

apps/backend/src/modules/complex/handlers/create-complex.handler.ts

@@ -5,8 +5,8 @@ import type { CreateComplexInput } from '@repo/api-contract';
 export async function createComplexHandler(c: AppContext) {
   const payload = c.req.valid('json' as never) as CreateComplexInput;
 
-  const authUser = c.get('authUser');
-  const adminEmail = authUser.email;
+  const user = c.get('user');
+  const adminEmail = user.email;
 
   if (!adminEmail) {
     return c.json({ message: 'El usuario autenticado no tiene email.' }, 400);

apps/backend/src/modules/complex/handlers/list-my-complexes.handler.ts

@@ -2,7 +2,7 @@ import { listMyComplexes } from '@/modules/complex/services/complex.service';
 import type { AppContext } from '@/types/hono';
 
 export async function listMyComplexesHandler(c: AppContext) {
-  const appUserId = c.get('appUserId');
-  const complexes = await listMyComplexes(appUserId);
+  const user = c.get('user');
+  const complexes = await listMyComplexes(user.id);
   return c.json(complexes);
 }

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

@@ -93,9 +93,9 @@ export async function getComplexBySlug(slug: string) {
   });
 }
 
-export async function listMyComplexes(appUserId: string) {
+export async function listMyComplexes(userId: string) {
   const complexUsers = await db.complexUser.findMany({
-    where: { userId: appUserId },
+    where: { userId },
     include: {
       complex: true,
     },