diff --git a/tenant-service/src/main/java/com/xuqm/tenant/config/PrivateTenantBootstrapInitializer.java b/tenant-service/src/main/java/com/xuqm/tenant/config/PrivateTenantBootstrapInitializer.java
index c1b2020..e592aaf 100644
--- a/tenant-service/src/main/java/com/xuqm/tenant/config/PrivateTenantBootstrapInitializer.java
+++ b/tenant-service/src/main/java/com/xuqm/tenant/config/PrivateTenantBootstrapInitializer.java
@@ -89,6 +89,11 @@ public class PrivateTenantBootstrapInitializer implements ApplicationRunner {
         if (app == null) {
             provisioningService.ensureApp(bootstrapAppKey, true);
             log.info("[PRIVATE] Bootstrap app created: {}", bootstrapAppKey);
+        } else if (!app.isDefault() || app.isDeletable()) {
+            app.setDefault(true);
+            app.setDeletable(false);
+            appRepository.save(app);
+            log.info("[PRIVATE] Bootstrap app marked as system app: {}", bootstrapAppKey);
         }
     }
 }
diff --git a/tenant-service/src/main/java/com/xuqm/tenant/config/SdkAppInitializer.java b/tenant-service/src/main/java/com/xuqm/tenant/config/SdkAppInitializer.java
index bbd5030..649d7eb 100644
--- a/tenant-service/src/main/java/com/xuqm/tenant/config/SdkAppInitializer.java
+++ b/tenant-service/src/main/java/com/xuqm/tenant/config/SdkAppInitializer.java
@@ -1,6 +1,9 @@
 package com.xuqm.tenant.config;
 
+import com.xuqm.tenant.entity.AppEntity;
+import com.xuqm.tenant.repository.AppRepository;
 import com.xuqm.tenant.service.SdkAppProvisioningService;
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.ApplicationArguments;
 import org.springframework.boot.ApplicationRunner;
 import org.springframework.stereotype.Component;
@@ -9,13 +12,42 @@ import org.springframework.stereotype.Component;
 public class SdkAppInitializer implements ApplicationRunner {
 
     private final SdkAppProvisioningService provisioningService;
+    private final PrivateDeploymentProperties deployProps;
+    private final AppRepository appRepository;
 
-    public SdkAppInitializer(SdkAppProvisioningService provisioningService) {
+    @Value("${sdk.bootstrap-app-key:ak_demo_chat}")
+    private String bootstrapAppKey;
+
+    @Value("${sdk.im-platform-app-key:ak_409e217e4aa14254ad73ad3c}")
+    private String imPlatformAppKey;
+
+    public SdkAppInitializer(SdkAppProvisioningService provisioningService,
+                             PrivateDeploymentProperties deployProps,
+                             AppRepository appRepository) {
         this.provisioningService = provisioningService;
+        this.deployProps = deployProps;
+        this.appRepository = appRepository;
     }
 
     @Override
     public void run(ApplicationArguments args) {
-        provisioningService.ensureBootstrapApp();
+        migrateExistingSystemApps();
+        if (!deployProps.isPrivate()) {
+            provisioningService.ensureBootstrapApp();
+        }
+    }
+
+    private void migrateExistingSystemApps() {
+        markSystemApp(bootstrapAppKey);
+        markSystemApp(imPlatformAppKey);
+    }
+
+    private void markSystemApp(String appKey) {
+        AppEntity app = appRepository.findByAppKey(appKey).orElse(null);
+        if (app != null && (!app.isDefault() || app.isDeletable())) {
+            app.setDefault(true);
+            app.setDeletable(false);
+            appRepository.save(app);
+        }
     }
 }
diff --git a/tenant-service/src/main/java/com/xuqm/tenant/service/AppService.java b/tenant-service/src/main/java/com/xuqm/tenant/service/AppService.java
index ccab18b..3d61943 100644
--- a/tenant-service/src/main/java/com/xuqm/tenant/service/AppService.java
+++ b/tenant-service/src/main/java/com/xuqm/tenant/service/AppService.java
@@ -33,7 +33,9 @@ public class AppService {
     }
 
     public List<AppEntity> listByTenant(String tenantId) {
-        return appRepository.findByTenantId(tenantId);
+        return appRepository.findByTenantId(tenantId).stream()
+                .filter(app -> !app.isDefault())
+                .toList();
     }
 
     public AppEntity getByAppKey(String appKey, String tenantId) {
diff --git a/tenant-service/src/main/java/com/xuqm/tenant/service/SdkAppProvisioningService.java b/tenant-service/src/main/java/com/xuqm/tenant/service/SdkAppProvisioningService.java
index 6caf44f..f6870e0 100644
--- a/tenant-service/src/main/java/com/xuqm/tenant/service/SdkAppProvisioningService.java
+++ b/tenant-service/src/main/java/com/xuqm/tenant/service/SdkAppProvisioningService.java
@@ -88,6 +88,8 @@ public class SdkAppProvisioningService {
         app.setAppKey(appKey);
         app.setAppSecret(generateSecret());
         app.setCreatedAt(LocalDateTime.now());
+        app.setDefault(true);
+        app.setDeletable(false);
         app = appRepository.save(app);
 
         if (bootstrapDefaults) {
diff --git a/update-service/src/main/java/com/xuqm/update/controller/GlobalExceptionHandler.java b/update-service/src/main/java/com/xuqm/update/controller/GlobalExceptionHandler.java
index 6eccf7a..6238145 100644
--- a/update-service/src/main/java/com/xuqm/update/controller/GlobalExceptionHandler.java
+++ b/update-service/src/main/java/com/xuqm/update/controller/GlobalExceptionHandler.java
@@ -46,13 +46,8 @@ public class GlobalExceptionHandler {
     @ExceptionHandler(Exception.class)
     public ResponseEntity<ApiResponse<Void>> handle(Exception ex) {
         log.error("Unhandled exception", ex);
-        String detail = ex.getClass().getSimpleName() + ": " + ex.getMessage();
-        Throwable cause = ex.getCause();
-        if (cause != null) {
-            detail += " | caused by: " + cause.getClass().getSimpleName() + ": " + cause.getMessage();
-        }
         return ResponseEntity.internalServerError()
-                .body(ApiResponse.error(500, detail));
+                .body(ApiResponse.error(500, "服务器内部错误"));
     }
 
     private HttpStatus resolveStatus(int code) {
diff --git a/update-service/src/main/java/com/xuqm/update/repository/AppPublishConfigRepository.java b/update-service/src/main/java/com/xuqm/update/repository/AppPublishConfigRepository.java
index 9544176..ef3464b 100644
--- a/update-service/src/main/java/com/xuqm/update/repository/AppPublishConfigRepository.java
+++ b/update-service/src/main/java/com/xuqm/update/repository/AppPublishConfigRepository.java
@@ -6,5 +6,5 @@ import org.springframework.data.jpa.repository.JpaRepository;
 import java.util.Optional;
 
 public interface AppPublishConfigRepository extends JpaRepository<AppPublishConfigEntity, String> {
-    Optional<AppPublishConfigEntity> findByAppKey(String appKey);
+    Optional<AppPublishConfigEntity> findTopByAppKeyOrderByUpdatedAtDesc(String appKey);
 }
diff --git a/update-service/src/main/java/com/xuqm/update/repository/AppStoreConfigRepository.java b/update-service/src/main/java/com/xuqm/update/repository/AppStoreConfigRepository.java
index 1fb0e0c..0e7a43e 100644
--- a/update-service/src/main/java/com/xuqm/update/repository/AppStoreConfigRepository.java
+++ b/update-service/src/main/java/com/xuqm/update/repository/AppStoreConfigRepository.java
@@ -12,5 +12,5 @@ public interface AppStoreConfigRepository extends JpaRepository<AppStoreConfigEn
 
     List<AppStoreConfigEntity> findByAppKeyAndEnabled(String appKey, boolean enabled);
 
-    Optional<AppStoreConfigEntity> findByAppKeyAndStoreType(String appKey, AppStoreConfigEntity.StoreType storeType);
+    Optional<AppStoreConfigEntity> findTopByAppKeyAndStoreTypeOrderByUpdatedAtDesc(String appKey, AppStoreConfigEntity.StoreType storeType);
 }
diff --git a/update-service/src/main/java/com/xuqm/update/service/AppStoreService.java b/update-service/src/main/java/com/xuqm/update/service/AppStoreService.java
index d4a331d..16c9eb3 100644
--- a/update-service/src/main/java/com/xuqm/update/service/AppStoreService.java
+++ b/update-service/src/main/java/com/xuqm/update/service/AppStoreService.java
@@ -69,7 +69,7 @@ public class AppStoreService {
                                            AppStoreConfigEntity.StoreType storeType,
                                            String configJson,
                                            boolean enabled) {
-        boolean isCreate = configRepo.findByAppKeyAndStoreType(appKey, storeType).isEmpty();
+        boolean isCreate = configRepo.findTopByAppKeyAndStoreTypeOrderByUpdatedAtDesc(appKey, storeType).isEmpty();
         AppStoreConfigEntity entity = configRepo
                 .findByAppKeyAndStoreType(appKey, storeType)
                 .orElseGet(AppStoreConfigEntity::new);
@@ -97,7 +97,7 @@ public class AppStoreService {
     }
 
     public void deleteConfig(String appKey, AppStoreConfigEntity.StoreType storeType) {
-        configRepo.findByAppKeyAndStoreType(appKey, storeType).ifPresent(cfg -> {
+        configRepo.findTopByAppKeyAndStoreTypeOrderByUpdatedAtDesc(appKey, storeType).ifPresent(cfg -> {
             configRepo.delete(cfg);
             operationLogService.record(
                     appKey,
@@ -245,7 +245,7 @@ public class AppStoreService {
     }
 
     public Map<String, String> getReviewWebhookConfig(String appKey) throws Exception {
-        AppStoreConfigEntity cfg = configRepo.findByAppKeyAndStoreType(
+        AppStoreConfigEntity cfg = configRepo.findTopByAppKeyAndStoreTypeOrderByUpdatedAtDesc(
                 appKey, AppStoreConfigEntity.StoreType.REVIEW_WEBHOOK).orElse(null);
         if (cfg == null || !cfg.isEnabled() || cfg.getConfigJson() == null || cfg.getConfigJson().isBlank()) {
             return Map.of();
@@ -257,7 +257,7 @@ public class AppStoreService {
         if (storeType == null || storeType == AppStoreConfigEntity.StoreType.REVIEW_WEBHOOK) {
             return "";
         }
-        return configRepo.findByAppKeyAndStoreType(appKey, storeType)
+        return configRepo.findTopByAppKeyAndStoreTypeOrderByUpdatedAtDesc(appKey, storeType)
                 .filter(AppStoreConfigEntity::isEnabled)
                 .map(AppStoreConfigEntity::getConfigJson)
                 .map(this::extractJumpUrl)
diff --git a/update-service/src/main/java/com/xuqm/update/service/PublishConfigService.java b/update-service/src/main/java/com/xuqm/update/service/PublishConfigService.java
index e9429d0..dff0b12 100644
--- a/update-service/src/main/java/com/xuqm/update/service/PublishConfigService.java
+++ b/update-service/src/main/java/com/xuqm/update/service/PublishConfigService.java
@@ -45,7 +45,7 @@ public class PublishConfigService {
     }
 
     public AppPublishConfigEntity getConfig(String appKey) {
-        return configRepository.findByAppKey(appKey).orElseGet(() -> {
+        return configRepository.findTopByAppKeyOrderByUpdatedAtDesc(appKey).orElseGet(() -> {
             AppPublishConfigEntity entity = new AppPublishConfigEntity();
             entity.setId(UUID.randomUUID().toString());
             entity.setAppKey(appKey);
@@ -56,7 +56,7 @@ public class PublishConfigService {
     }
 
     public AppPublishConfigEntity saveConfig(String appKey, Map<String, Object> body) {
-        AppPublishConfigEntity entity = configRepository.findByAppKey(appKey).orElseGet(AppPublishConfigEntity::new);
+        AppPublishConfigEntity entity = configRepository.findTopByAppKeyOrderByUpdatedAtDesc(appKey).orElseGet(AppPublishConfigEntity::new);
         if (entity.getId() == null) {
             entity.setId(UUID.randomUUID().toString());
             entity.setAppKey(appKey);
@@ -71,7 +71,7 @@ public class PublishConfigService {
     }
 
     public JsonNode getConfigNode(String appKey) {
-        AppPublishConfigEntity entity = configRepository.findByAppKey(appKey).orElse(null);
+        AppPublishConfigEntity entity = configRepository.findTopByAppKeyOrderByUpdatedAtDesc(appKey).orElse(null);
         if (entity == null || entity.getConfigJson() == null || entity.getConfigJson().isBlank()) {
             try {
                 return objectMapper.readTree(defaultConfigJson());
diff --git a/update-service/src/main/java/com/xuqm/update/service/StoreSubmissionService.java b/update-service/src/main/java/com/xuqm/update/service/StoreSubmissionService.java
index 3eacc15..907520f 100644
--- a/update-service/src/main/java/com/xuqm/update/service/StoreSubmissionService.java
+++ b/update-service/src/main/java/com/xuqm/update/service/StoreSubmissionService.java
@@ -398,7 +398,7 @@ public class StoreSubmissionService {
         for (String storeType : targets) {
             AppStoreConfigEntity cfg;
             try {
-                cfg = configRepo.findByAppKeyAndStoreType(v.getAppKey(),
+                cfg = configRepo.findTopByAppKeyAndStoreTypeOrderByUpdatedAtDesc(v.getAppKey(),
                         AppStoreConfigEntity.StoreType.valueOf(storeType)).orElse(null);
             } catch (Exception e) {
                 results.add(StoreRemoteState.failed(
@@ -694,7 +694,7 @@ public class StoreSubmissionService {
                 if (!isUnderReview && !isRejected) continue;
                 AppStoreConfigEntity cfg;
                 try {
-                    cfg = configRepo.findByAppKeyAndStoreType(v.getAppKey(),
+                    cfg = configRepo.findTopByAppKeyAndStoreTypeOrderByUpdatedAtDesc(v.getAppKey(),
                             AppStoreConfigEntity.StoreType.valueOf(storeType)).orElse(null);
                 } catch (Exception e) {
                     continue;
@@ -779,7 +779,7 @@ public class StoreSubmissionService {
         for (String storeType : targets) {
             AppStoreConfigEntity cfg;
             try {
-                cfg = configRepo.findByAppKeyAndStoreType(v.getAppKey(),
+                cfg = configRepo.findTopByAppKeyAndStoreTypeOrderByUpdatedAtDesc(v.getAppKey(),
                         AppStoreConfigEntity.StoreType.valueOf(storeType)).orElse(null);
             } catch (Exception e) {
                 results.add(StoreRemoteState.failed(