fix: 重复提交按hash判重，同hash跳过，异hash覆盖更新

par-core/src/main/java/com/par/core/service/impl/ConfigServiceImpl.java

@@ -60,14 +60,26 @@ public class ConfigServiceImpl implements ConfigService {
     public SiteConfig submitConfig(String siteId, String version, String configJson,
                                    String schemaVersion, Long submitterId) {
         SiteConfig existing = getConfig(siteId, version);
-        if (existing != null) {
-            log.info("配置版本已存在，跳过: siteId={}, version={}", siteId, version);
-            return existing;
-        }
-
         String configHash = HmacUtil.sha256(configJson);
         String storagePath = String.format("configs/%s/%s.json", siteId, version);
 
+        // 版本已存在 → 根据 hash 判断是重复还是更新
+        if (existing != null) {
+            if (configHash.equals(existing.getConfigHash())) {
+                log.info("配置未变化，跳过: siteId={}, version={}, hash={}", siteId, version, configHash);
+                return existing;
+            }
+            // hash 不同 → 覆盖更新
+            log.info("配置内容变化，更新: siteId={}, version={}, oldHash={}, newHash={}",
+                    siteId, version, existing.getConfigHash(), configHash);
+            storageService.store(storagePath, configJson);
+            existing.setConfigHash(configHash);
+            existing.setFileSize((long) configJson.getBytes(StandardCharsets.UTF_8).length);
+            existing.setStoragePath(storagePath);
+            siteConfigMapper.updateById(existing);
+            return existing;
+        }
+
         // 存储到抽象存储层（七牛或本地）
         try {
             storageService.store(storagePath, configJson);