refactor: 文件路径按pending/approved区分，去掉版本号

- submit: configs/{siteId}/pending/{hash}.json
- approve: 文件移到 configs/{siteId}/approved/{hash}.json

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

@@ -57,7 +57,7 @@ public class ConfigServiceImpl implements ConfigService {
     public SiteConfig submitConfig(String siteId, String version, String configJson,
                                    String schemaVersion, Long submitterId) {
         String configHash = HmacUtil.sha256(configJson);
-        String storagePath = String.format("configs/%s/%s/%s.json", siteId, version, configHash.substring(0, 8));
+        String storagePath = String.format("configs/%s/pending/%s.json", siteId, configHash.substring(0, 8));
 
         // 相同 hash 的提交 → 真正重复，跳过
         SiteConfig sameHash = siteConfigMapper.selectOne(