feat: License 支持筛选多选批量删除

仅已吊销或已过期可删，有效授权自动跳过；单条删除同步限制。

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/internal/dto/license.go

@@ -17,9 +17,17 @@ type LicenseRenew struct {
 	Duration int `json:"duration" binding:"required"`
 }
 
-// LicenseRevoke 吊销请求 // Logan.Li
-type LicenseRevoke struct {
-	Reason string `json:"reason"`
+// LicenseBatchDeleteRequest 批量删除请求 // Logan.Li
+type LicenseBatchDeleteRequest struct {
+	IDs []uint `json:"ids" binding:"required,min=1"`
+}
+
+// LicenseBatchDeleteResponse 批量删除响应 // Logan.Li
+type LicenseBatchDeleteResponse struct {
+	Deleted    int    `json:"deleted"`
+	Skipped    int    `json:"skipped"`
+	Failed     int    `json:"failed"`
+	SkippedIDs []uint `json:"skipped_ids,omitempty"`
 }
 
 // LicenseResponse License 响应 // Logan.Li