fix architecture and write new tests

apps/api/src/modules/auth/auth.company.service.ts

@@ -45,7 +45,7 @@ export async function signup(body: CompanySignupInput) {
   const trialEndAt = new Date(now.getTime() + TRIAL_PERIOD_DAYS * 24 * 60 * 60 * 1000)
   const passwordHash = await bcrypt.hash(body.password, 12)
 
-  const result = await prisma.$transaction((tx) => repo.createCompanySignup(tx, {
+  const result = await prisma.$transaction((tx: any) => repo.createCompanySignup(tx, {
     companyName: body.companyName,
     legalName: body.legalName,
     slug,