feat(whatsapp): 🎉 Add extended sending and template management

* Implemented new endpoints for sending various message types:
  - Audio
  - Sticker
  - Location
  - Contacts
  - Interactive messages
  - Template messages
  - Flow messages
  - Reactions
  - Marking messages as read

* Added template management endpoints:
  - List templates
  - Upload templates
  - Delete templates

* Introduced flow management endpoints:
  - List flows
  - Create flows
  - Get flow details
  - Upload flow assets
  - Publish flows
  - Delete flows

* Added phone number management endpoints:
  - List phone numbers
  - Request verification code
  - Verify code

* Enhanced media management with delete media endpoint.

* Updated dependencies.

pkg/whatsapp/businessapi/events.go

@@ -52,58 +52,78 @@ func (c *Client) HandleWebhook(r *http.Request) error {
 	return nil
 }
 
-// processChange processes a webhook change
+// processChange processes a webhook change.
+// change.Value is json.RawMessage because Meta uses different payload shapes per field type.
+// Each case unmarshals into the appropriate struct.
 func (c *Client) processChange(change WebhookChange) {
 	ctx := context.Background()
 
-	logging.Info("Processing webhook change",
-		"account_id", c.id,
-		"field", change.Field,
-		"phone_number_id", change.Value.Metadata.PhoneNumberID)
-
-	// Handle different field types
 	switch change.Field {
 	case "messages":
-		// Process messages
-		for i := range change.Value.Messages {
-			msg := change.Value.Messages[i]
-			c.processMessage(ctx, msg, change.Value.Contacts)
+		var value WebhookValue
+		if err := json.Unmarshal(change.Value, &value); err != nil {
+			logging.Error("Failed to parse messages webhook value",
+				"account_id", c.id, "error", err)
+			return
 		}
 
-		// Process statuses
-		for _, status := range change.Value.Statuses {
+		logging.Info("Processing webhook change",
+			"account_id", c.id,
+			"field", change.Field,
+			"phone_number_id", value.Metadata.PhoneNumberID)
+
+		for i := range value.Messages {
+			c.processMessage(ctx, value.Messages[i], value.Contacts)
+		}
+		for _, status := range value.Statuses {
 			c.processStatus(ctx, status)
 		}
 
 	case "message_template_status_update":
-		// Log template status updates for visibility
-		logging.Info("Message template status update received",
-			"account_id", c.id,
-			"phone_number_id", change.Value.Metadata.PhoneNumberID)
+		var value TemplateStatusValue
+		if err := json.Unmarshal(change.Value, &value); err != nil {
+			logging.Error("Failed to parse template status update",
+				"account_id", c.id, "error", err)
+			return
+		}
 
-	case "account_update":
-		// Log account updates
-		logging.Info("Account update received",
+		logging.Info("Template status update received",
 			"account_id", c.id,
-			"phone_number_id", change.Value.Metadata.PhoneNumberID)
+			"template_name", value.TemplateName,
+			"template_id", value.TemplateID,
+			"language", value.Language,
+			"status", value.Status,
+			"rejection_reasons", value.RejectionReasons)
 
-	case "phone_number_quality_update":
-		// Log quality updates
-		logging.Info("Phone number quality update received",
-			"account_id", c.id,
-			"phone_number_id", change.Value.Metadata.PhoneNumberID)
+		c.eventBus.Publish(events.TemplateStatusUpdateEvent(
+			ctx,
+			c.id,
+			value.TemplateName,
+			value.TemplateID,
+			value.Language,
+			value.Status,
+			value.RejectionReasons,
+		))
 
-	case "phone_number_name_update":
-		// Log name updates
-		logging.Info("Phone number name update received",
-			"account_id", c.id,
-			"phone_number_id", change.Value.Metadata.PhoneNumberID)
+	case "account_update", "phone_number_quality_update", "phone_number_name_update", "account_alerts":
+		// These all carry the standard WebhookValue with metadata
+		var value WebhookValue
+		if err := json.Unmarshal(change.Value, &value); err != nil {
+			logging.Error("Failed to parse webhook value",
+				"account_id", c.id, "field", change.Field, "error", err)
+			return
+		}
 
-	case "account_alerts":
-		// Log account alerts
-		logging.Warn("Account alert received",
-			"account_id", c.id,
-			"phone_number_id", change.Value.Metadata.PhoneNumberID)
+		if change.Field == "account_alerts" {
+			logging.Warn("Account alert received",
+				"account_id", c.id,
+				"phone_number_id", value.Metadata.PhoneNumberID)
+		} else {
+			logging.Info("Webhook notification received",
+				"account_id", c.id,
+				"field", change.Field,
+				"phone_number_id", value.Metadata.PhoneNumberID)
+		}
 
 	default:
 		logging.Debug("Unknown webhook field type",