feat(inboxes): align whatsapp health endpoints

internal/handler/api/v1/inbox_handler.go

@@ -2,6 +2,7 @@ package v1
 
 import (
 	"encoding/json"
+	"errors"
 	"io"
 	"net/http"
 	"strconv"
@@ -623,6 +624,10 @@ func (h *InboxHandler) Health(c *gin.Context) {
 
 	result, svcErr := h.svc.Health(c.Request.Context(), accountID, inboxID)
 	if svcErr != nil {
+		if errors.Is(svcErr, service.ErrInboxHealthWhatsAppCloudOnly) {
+			c.JSON(http.StatusBadRequest, gin.H{"error": service.InboxHealthWhatsAppCloudOnlyMessage})
+			return
+		}
 		handleServiceError(c, svcErr)
 		return
 	}
@@ -677,9 +682,11 @@ func (h *InboxHandler) RegisterWebhook(c *gin.Context) {
 	}
 
 	var req service.RegisterWebhookRequest
-	if err := c.ShouldBindJSON(&req); err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid request body: " + err.Error()})
-		return
+	if c.Request.Body != nil && c.Request.ContentLength != 0 {
+		if err := c.ShouldBindJSON(&req); err != nil {
+			c.JSON(http.StatusBadRequest, gin.H{"error": "invalid request body: " + err.Error()})
+			return
+		}
 	}
 	if !h.svc.Ready() {
 		response.AbortWithStatusError(c, http.StatusUnprocessableEntity, response.ErrInternal, "failed to register webhook")
@@ -688,11 +695,15 @@ func (h *InboxHandler) RegisterWebhook(c *gin.Context) {
 
 	svcErr := h.svc.RegisterWebhook(c.Request.Context(), accountID, inboxID, req)
 	if svcErr != nil {
+		if errors.Is(svcErr, service.ErrInboxHealthWhatsAppCloudOnly) {
+			c.JSON(http.StatusBadRequest, gin.H{"error": service.InboxHealthWhatsAppCloudOnlyMessage})
+			return
+		}
 		handleServiceError(c, svcErr)
 		return
 	}
 
-	c.JSON(http.StatusOK, gin.H{"message": "webhook registered successfully"})
+	c.JSON(http.StatusOK, gin.H{"message": "Webhook registered successfully"})
 }
 
 // GetAgentBot retrieves the currently active agent bot for an inbox.