feat: implement complex selection flow

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

@@ -1,5 +1,6 @@
 import { createHash } from 'node:crypto';
 import type { User } from '@/lib/auth';
+import { db } from '@/lib/prisma';
 import type { UserProfile } from '@repo/api-contract';
 
 function getGravatarUrl(email: string): string {
@@ -7,12 +8,29 @@ function getGravatarUrl(email: string): string {
   return `https://www.gravatar.com/avatar/${hash}?d=identicon`;
 }
 
-export function getUserProfile(user: User): UserProfile {
+export async function getUserProfile(user: User, complexId?: string): Promise<UserProfile> {
+  let role = 'member';
+
+  if (complexId) {
+    const complexUser = await db.complexUser.findUnique({
+      where: {
+        complexId_userId: {
+          complexId,
+          userId: user.id,
+        },
+      },
+    });
+
+    if (complexUser) {
+      role = complexUser.role.toLowerCase();
+    }
+  }
+
   return {
     id: user.id,
     fullName: user.name,
     email: user.email,
-    role: (user as any).role || 'member',
+    role,
     avatarUrl: user.image || getGravatarUrl(user.email),
     createdAt: user.createdAt.toISOString(),
   };