feat: implement WhatsApp connection and message metrics

Added tracking for all WhatsApp-related metrics:

Connection metrics:
- active_connections: Gauge tracking active connections (inc on open, dec on close)
- connection_attempts_total: Counter for connection attempts (success/failure)

Message metrics:
- messages_sent_total: Counter with type label (text, image, video, audio, etc)
- messages_received_total: Counter with type label
- history_sync_messages_total: Counter for history sync messages

Added helper functions in prometheus-metrics.ts:
- incrementActiveConnections(), decrementActiveConnections(), setActiveConnections()
- recordConnectionAttempt(status)
- recordMessageSent(type), recordMessageReceived(type)
- recordMessageRetry(type), recordMessageFailure(type, reason)
- setMessagesQueued(count, priority)
- recordHistorySyncMessages(count)

src/Socket/socket.ts

@@ -54,7 +54,12 @@ import {
 	jidEncode,
 	S_WHATSAPP_NET
 } from '../WABinary'
-import { recordConnectionError } from '../Utils/prometheus-metrics'
+import {
+	recordConnectionError,
+	recordConnectionAttempt,
+	incrementActiveConnections,
+	decrementActiveConnections
+} from '../Utils/prometheus-metrics'
 import { BinaryInfo } from '../WAM/BinaryInfo.js'
 import { USyncQuery, USyncUser } from '../WAUSync/'
 import { WebSocketClient } from './Client'
@@ -764,8 +769,12 @@ export const makeSocket = (config: SocketConfig) => {
 					errorType = `error_${statusCode}`
 			}
 			recordConnectionError(errorType)
+			recordConnectionAttempt('failure')
 		}
 
+		// Decrement active connections
+		decrementActiveConnections()
+
 		clearInterval(keepAliveReq)
 		clearTimeout(qrTimer)
 
@@ -1080,6 +1089,10 @@ export const makeSocket = (config: SocketConfig) => {
 
 		ev.emit('connection.update', { connection: 'open' })
 
+		// Record successful connection metrics
+		recordConnectionAttempt('success')
+		incrementActiveConnections()
+
 		if (node.attrs.lid && authState.creds.me?.id) {
 			const myLID = node.attrs.lid
 			process.nextTick(async () => {