🐛 fix(redis): 修正 hash 字段删除参数序列化错误

- 前端统一按数组传递 hash 字段删除参数
- 后端兼容单字符串与数组两种删除入参
- 补充 Redis hash 字段删除回归测试

Fixes #343

frontend/src/components/RedisViewer.tsx

@@ -1194,7 +1194,7 @@ const RedisViewer: React.FC<RedisViewerProps> = ({ connectionId, redisDB }) => {
                 const config = getConfig();
                 if (!config) return;
                 try {
-                    const res = await (window as any).go.app.App.RedisDeleteHashField(buildRpcConnectionConfig(config), selectedKey, field);
+                    const res = await (window as any).go.app.App.RedisDeleteHashField(buildRpcConnectionConfig(config), selectedKey, [field]);
                     if (res.success) {
                         message.success('删除成功');
                         loadKeyValue(selectedKey);