fix(tenant): listByApp 按平台去重，返回每个平台的服务记录

原实现按 serviceType findFirst，导致同一 serviceType 下不同平台
的配置（如 ANDROID/IOS/HARMONY PUSH）只返回第一条，ANDROID 推送
配置对外不可见。改为按 (serviceType, platform) 组合去重。

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

tenant-service/src/main/java/com/xuqm/tenant/service/FeatureServiceManager.java

@@ -59,7 +59,9 @@ public class FeatureServiceManager {
             return services;
         }
 
+        // Deduplicate by (serviceType, platform) — preserve each platform's service record
         List<FeatureServiceEntity> normalized = new ArrayList<>();
+        java.util.Set<String> seen = new java.util.LinkedHashSet<>();
         for (FeatureServiceEntity.ServiceType serviceType : List.of(
                 FeatureServiceEntity.ServiceType.IM,
                 FeatureServiceEntity.ServiceType.PUSH,
@@ -67,10 +69,15 @@ public class FeatureServiceManager {
                 FeatureServiceEntity.ServiceType.FILE,
                 FeatureServiceEntity.ServiceType.LICENSE,
                 FeatureServiceEntity.ServiceType.BUG_COLLECT)) {
+            for (FeatureServiceEntity.Platform platform : FeatureServiceEntity.Platform.values()) {
                 services.stream()
-                    .filter(service -> service.getServiceType() == serviceType)
+                        .filter(s -> s.getServiceType() == serviceType && s.getPlatform() == platform)
                         .findFirst()
-                    .ifPresent(normalized::add);
+                        .ifPresent(s -> {
+                            String key = serviceType + ":" + platform;
+                            if (seen.add(key)) normalized.add(s);
+                        });
+            }
         }
         return normalized.isEmpty() ? services : normalized;
     }