refactor(contact): corrige feedback de code review para salvar contato

- Ajusta schema de validação: usa ID estático e melhora validação de campos.
- Atualiza controller: adiciona verificação de provedor.
- Melhora router: usa status 201 e aproveita global error handling.
- Adiciona métodos stub ausentes para provedores Evolution e Meta.
- Aprimora mensagens de erro no serviço Baileys.

Author: FaelN1

src/api/controllers/contact.controller.ts

@@ -1,11 +1,20 @@
-import { SaveContactDto } from '@api/dto/contact.dto';
-import { InstanceDto } from '@api/dto/instance.dto';
-import { WAMonitoringService } from '@api/services/monitor.service';
-
-export class ContactController {
-  constructor(private readonly waMonitor: WAMonitoringService) {}
-
-  public async saveContact({ instanceName }: InstanceDto, data: SaveContactDto) {
-    return await this.waMonitor.waInstances[instanceName].saveContact(data);
-  }
-}
+import { SaveContactDto } from '@api/dto/contact.dto';
+import { InstanceDto } from '@api/dto/instance.dto';
+import { WAMonitoringService } from '@api/services/monitor.service';
+import { BadRequestException } from '@exceptions';
+
+export class ContactController {
+  constructor(private readonly waMonitor: WAMonitoringService) {}
+
+  public async saveContact({ instanceName }: InstanceDto, data: SaveContactDto) {
+    const instance = this.waMonitor.waInstances[instanceName];
+
+    if (!instance || typeof (instance as any).saveContact !== 'function') {
+      throw new BadRequestException(
+        `saveContact is not supported for the provider used by instance "${instanceName}"`,
+      );
+    }
+
+    return await (instance as any).saveContact(data);
+  }
+}