fix: use MACOS platform to resolve 405 connection failure

WhatsApp servers reject UserAgent.Platform.WEB (value 14) since
Feb 2026, causing 405 on new device pairing. MACOS (value 24)
matches current WhatsApp Web behavior. Ref: Baileys#2365, #2370.

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

src/Utils/validate-connection.ts

@@ -20,7 +20,7 @@ const getUserAgent = (config: SocketConfig): proto.ClientPayload.IUserAgent => {
 			secondary: config.version[1],
 			tertiary: config.version[2]
 		},
-		platform: proto.ClientPayload.UserAgent.Platform.WEB,
+		platform: proto.ClientPayload.UserAgent.Platform.MACOS,
 		releaseChannel: proto.ClientPayload.UserAgent.ReleaseChannel.RELEASE,
 		osVersion: '0.1',
 		device: 'Desktop',