fix(tenant-service): packageName 为空时跳过包名校验

SDK 未传 packageName 时默认为空字符串，不应与注册包名做比对。
只在 packageName 非空时才执行校验。

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tenant-service/src/main/java/com/xuqm/tenant/controller/SdkConfigController.java

@@ -150,7 +150,7 @@ public class SdkConfigController {
             case HARMONY -> app.getHarmonyBundleName();
             default -> app.getPackageName();
         };
-        if (registered != null && !registered.isBlank() && !registered.equals(packageName)) {
+        if (registered != null && !registered.isBlank() && !packageName.isBlank() && !registered.equals(packageName)) {
             throw new BusinessException(403, "包名与应用配置不匹配");
         }
     }