feat: refactor onboarding into a multi-step flow with dedicated routes and session state management

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

@@ -368,6 +368,11 @@ export async function completeOnboarding(input: OnboardingCompleteInput) {
   const complexSlug = await buildUniqueComplexSlug(input.complexName);
 
   const result = await db.$transaction(async (tx) => {
+    await tx.user.update({
+      where: { id: user.id },
+      data: { emailVerified: true },
+    });
+
     const complex = await tx.complex.create({
       data: {
         id: uuidv7(),