fix(send-media): use upsert to prevent P2002 duplicate messageId error

MessageHandler can insert the echo of a sent message before the HTTP
handler does — replace prisma.message.create() with upsert() so both
paths converge safely instead of crashing with a unique constraint error.

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

clube67/newwhats.local/backend/src/modules/whatsapp/whatsapp.media.routes.ts

@@ -167,8 +167,10 @@ export function buildMediaRoutes(manager: WhatsAppConnectionManager): Router {
         })
 
         const messageType = mediaType.toUpperCase() as any
-        const msg = await prisma.message.create({
-          data: {
+        // Usa upsert para evitar P2002 — o MessageHandler pode ter inserido antes
+        const msg = await prisma.message.upsert({
+          where: { instanceId_messageId: { instanceId, messageId } },
+          create: {
             tenantId,
             instanceId,
             chatId: chat.id,
@@ -183,6 +185,11 @@ export function buildMediaRoutes(manager: WhatsAppConnectionManager): Router {
             status: 'SENT',
             timestamp: new Date(),
           },
+          update: {
+            mediaUrl,
+            mimeType: mimetype,
+            status: 'SENT',
+          },
         })
 
         logger.info({ instanceId, jid, mediaType, size }, 'Mídia enviada')