feat(conversations): align transcript responses

internal/handler/api/v1/conversation_handler.go

@@ -687,12 +687,16 @@ func (h *ConversationHandler) Transcript(c *gin.Context) {
 	}
 
 	var req struct {
-		Email string `json:"email" binding:"required,email"`
+		Email string `json:"email"`
 	}
 	if err := c.ShouldBindJSON(&req); err != nil {
 		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
 		return
 	}
+	if strings.TrimSpace(req.Email) == "" {
+		c.JSON(http.StatusUnprocessableEntity, gin.H{"error": "email param missing"})
+		return
+	}
 
 	conversation, ok := h.resolveConversationRoute(c, accountID, conversationID)
 	if !ok {
@@ -703,7 +707,7 @@ func (h *ConversationHandler) Transcript(c *gin.Context) {
 		return
 	}
 
-	response.OK(c, nil)
+	c.Status(http.StatusOK)
 }
 
 // UpdateCustomAttributes updates the custom attributes of a conversation.