Fix Decimal.toFixed crash and new professionals default is_active

- Detail page: use Number() before toFixed() since Prisma returns Decimal objects
- Service upsert: create professionals with is_active:false so they appear as pending

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/professionals/professionals.service.ts

@@ -72,7 +72,7 @@ export class ProfessionalsService {
 
     if (!existing) {
       await this.prisma.users.update({ where: { id: userId }, data: { pro_state: 1 } });
-      return this.prisma.professionals.create({ data: { user_id: userId, ...data } });
+      return this.prisma.professionals.create({ data: { user_id: userId, is_active: false, ...data } });
     }
 
     return this.prisma.professionals.update({ where: { user_id: userId }, data });