fix: unify handler response format in log, permission, webhook handlers

- log_handler.go: Fix GetMyLoginLogs/GetMyOperationLogs/GetLoginLogs/GetOperationLogs to use {code, message, data}
- permission_handler.go: Fix all error responses to use {code, message}
- webhook_handler.go: Add missing "message" field in success responses, wrap data in data object with list/total/page/page_size
- webhook_handler_test.go: Update test to match new response format

Standardize all JSON responses to {code: 0, message: "success", data: ...} for success
and {code: XXX, message: "..."} for errors.

internal/api/handler/permission_handler.go

@@ -23,7 +23,7 @@ func NewPermissionHandler(permissionService *service.PermissionService) *Permiss
 func (h *PermissionHandler) CreatePermission(c *gin.Context) {
 	var req service.CreatePermissionRequest
 	if err := c.ShouldBindJSON(&req); err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		c.JSON(http.StatusBadRequest, gin.H{"code": 400, "message": err.Error()})
 		return
 	}
 
@@ -43,7 +43,7 @@ func (h *PermissionHandler) CreatePermission(c *gin.Context) {
 func (h *PermissionHandler) ListPermissions(c *gin.Context) {
 	var req service.ListPermissionRequest
 	if err := c.ShouldBindQuery(&req); err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		c.JSON(http.StatusBadRequest, gin.H{"code": 400, "message": err.Error()})
 		return
 	}
 
@@ -63,7 +63,7 @@ func (h *PermissionHandler) ListPermissions(c *gin.Context) {
 func (h *PermissionHandler) GetPermission(c *gin.Context) {
 	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
 	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid permission id"})
+		c.JSON(http.StatusBadRequest, gin.H{"code": 400, "message": "invalid permission id"})
 		return
 	}
 
@@ -83,13 +83,13 @@ func (h *PermissionHandler) GetPermission(c *gin.Context) {
 func (h *PermissionHandler) UpdatePermission(c *gin.Context) {
 	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
 	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid permission id"})
+		c.JSON(http.StatusBadRequest, gin.H{"code": 400, "message": "invalid permission id"})
 		return
 	}
 
 	var req service.UpdatePermissionRequest
 	if err := c.ShouldBindJSON(&req); err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		c.JSON(http.StatusBadRequest, gin.H{"code": 400, "message": err.Error()})
 		return
 	}
 
@@ -109,7 +109,7 @@ func (h *PermissionHandler) UpdatePermission(c *gin.Context) {
 func (h *PermissionHandler) DeletePermission(c *gin.Context) {
 	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
 	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid permission id"})
+		c.JSON(http.StatusBadRequest, gin.H{"code": 400, "message": "invalid permission id"})
 		return
 	}
 
@@ -127,7 +127,7 @@ func (h *PermissionHandler) DeletePermission(c *gin.Context) {
 func (h *PermissionHandler) UpdatePermissionStatus(c *gin.Context) {
 	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
 	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid permission id"})
+		c.JSON(http.StatusBadRequest, gin.H{"code": 400, "message": "invalid permission id"})
 		return
 	}
 
@@ -136,7 +136,7 @@ func (h *PermissionHandler) UpdatePermissionStatus(c *gin.Context) {
 	}
 
 	if err := c.ShouldBindJSON(&req); err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		c.JSON(http.StatusBadRequest, gin.H{"code": 400, "message": err.Error()})
 		return
 	}
 
@@ -147,7 +147,7 @@ func (h *PermissionHandler) UpdatePermissionStatus(c *gin.Context) {
 	case "disabled", "0":
 		status = domain.PermissionStatusDisabled
 	default:
-		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid status"})
+		c.JSON(http.StatusBadRequest, gin.H{"code": 400, "message": "invalid status"})
 		return
 	}