Fix upsert: create professional record if none exists

PATCH /professionals/me now works for first-time submissions.
Creates the record with pro_state=1 if user has no professional entry.

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

backend/src/professionals/professionals.service.ts

@@ -68,8 +68,12 @@ export class ProfessionalsService {
   }
 
   async upsert(userId: string, data: any) {
-    const prof = await this.prisma.professionals.findUnique({ where: { user_id: userId } });
-    if (!prof) throw new NotFoundException('Debes solicitar ser profesional primero');
+    const existing = await this.prisma.professionals.findUnique({ where: { user_id: userId } });
+
+    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.update({ where: { user_id: userId }, data });
   }