Fix: filtrar mensajes de protocolo en saveMessage

- Skip protocol messages (HISTORY_SYNC, SECURITY_NOTIFICATION, etc)
- Skip messages sin contenido real
- Agregar caption para video/document messages
- Solo guardar mensajes con contenido real de chat

server/services/baileys/manager.ts

@@ -492,6 +492,34 @@ class BaileysManager extends EventEmitter {
       const jid = msg.key.remoteJid
       if (!jid) return
 
+      // Skip protocol messages (internal WhatsApp messages)
+      if (msg.message?.protocolMessage) {
+        console.log(`[BaileysManager] Skipping protocol message: ${msg.message.protocolMessage.type}`)
+        return
+      }
+
+      // Skip if no actual message content
+      if (!msg.message) {
+        console.log(`[BaileysManager] Skipping message with no content`)
+        return
+      }
+
+      // Get message content
+      const content = msg.message?.conversation ||
+        msg.message?.extendedTextMessage?.text ||
+        msg.message?.imageMessage?.caption ||
+        msg.message?.videoMessage?.caption ||
+        msg.message?.documentMessage?.caption ||
+        ''
+
+      const messageType = this.getMessageType(msg.message)
+
+      // Skip unknown message types with no content (likely internal messages)
+      if (messageType === 'unknown' && !content) {
+        console.log(`[BaileysManager] Skipping unknown message type with no content`)
+        return
+      }
+
       // Ensure chat exists
       const chatResult = await query<{ id: string }>(
         `INSERT INTO chats (instance_id, jid, name, is_group)
@@ -502,14 +530,6 @@ class BaileysManager extends EventEmitter {
       )
       const chatId = chatResult.rows[0].id
 
-      // Get message content
-      const content = msg.message?.conversation ||
-        msg.message?.extendedTextMessage?.text ||
-        msg.message?.imageMessage?.caption ||
-        ''
-
-      const messageType = this.getMessageType(msg.message)
-
       // Insert message
       await query(
         `INSERT INTO messages (