feat: add automatic CTWA (Click-to-WhatsApp) ads message recovery

Messages from Facebook/Instagram ads (Click-to-WhatsApp) don't arrive on
linked devices because Meta's ads endpoint doesn't encrypt for multi-device.
They arrive as "Message absent from node" placeholders.

This change automatically requests the message from the primary phone via
PDO (Peer Data Operation) when a CTWA placeholder is detected.

Changes:
- Add enableCTWARecovery config option (default: true)
- Trigger requestPlaceholderResend() for "Message absent from node" errors
- Add Prometheus metrics for CTWA recovery tracking
- Add comprehensive unit tests for CTWA recovery functionality

Resolves: https://github.com/WhiskeySockets/Baileys/issues/1723
Resolves: https://github.com/WhiskeySockets/Baileys/issues/1034

src/Defaults/index.ts

@@ -70,6 +70,9 @@ export const DEFAULT_CONNECTION_CONFIG: SocketConfig = {
 	generateHighQualityLinkPreview: false,
 	enableAutoSessionRecreation: true,
 	enableRecentMessageCache: true,
+	// Enable automatic recovery of Click-to-WhatsApp ads messages
+	// These arrive as "placeholder messages" and need to be requested from the phone
+	enableCTWARecovery: true,
 	options: {},
 	appStateMacVerification: {
 		patch: false,