fix: 配置提交500 — 修正静态文件路径 + 启动时创建目录

- par.static.path 默认 ./static（不再重复 configs/）
- @PostConstruct 确保 static/configs 目录存在
- submitConfig 异常时详细日志

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

@@ -6,6 +6,7 @@ import com.par.core.entity.SiteConfig;
 import com.par.core.enums.ConfigStatus;
 import com.par.core.mapper.SiteConfigMapper;
 import com.par.core.service.ConfigService;
+import jakarta.annotation.PostConstruct;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Value;
@@ -32,6 +33,16 @@ public class ConfigServiceImpl implements ConfigService {
     @Value("${par.static.path:./static}")
     private String staticPath;
 
+    @PostConstruct
+    void init() {
+        try {
+            Files.createDirectories(Paths.get(staticPath, "configs"));
+            log.info("Config static dir ready: {}", Paths.get(staticPath, "configs").toAbsolutePath());
+        } catch (IOException e) {
+            log.error("Failed to create config static dir: {}", e.getMessage());
+        }
+    }
+
     @Override
     public SiteConfig getLatestConfig(String siteId) {
         return siteConfigMapper.selectLatestBySiteId(siteId);
@@ -71,7 +82,13 @@ public class ConfigServiceImpl implements ConfigService {
         String configHash = HmacUtil.sha256(configJson);
 
         // 存储静态文件
-        String storagePath = storeConfigFile(siteId, version, configJson);
+        String storagePath;
+        try {
+            storagePath = storeConfigFile(siteId, version, configJson);
+        } catch (Exception e) {
+            log.error("存储配置文件失败 siteId={} version={}: {}", siteId, version, e.getMessage());
+            throw new RuntimeException("存储配置文件失败: " + e.getMessage(), e);
+        }
 
         SiteConfig config = new SiteConfig();
         config.setSiteId(siteId);