fix(ext-api): /secretaria/ask usa chat.jid (não remoteJid inexistente)

prisma.chat.findFirst filtrava por remoteJid, que não existe no model Chat (é jid)
→ 500 em todo /secretaria/ask. Corrigido; endpoint retorna o reply normalmente.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

newwhats.clube67.com/newwhats.local/plugins/ext-api/backend/routes.js

@@ -789,7 +789,7 @@ function buildExtRoutes(prisma, manager, db, config, hooks, io) {
             });
             // SEC-01+SEC-11: envia reply via WA e persiste no banco principal
             const chat = await prisma.chat.findFirst({
-                where: { tenantId, remoteJid: chatId },
+                where: { tenantId, jid: chatId },
                 orderBy: { updatedAt: 'desc' },
                 select: { id: true, instanceId: true },
             });