feat(order): 添加订单可下载状态查询接口

- 在AppOrderV2Controller中引入RedisTemplate依赖
- 新增/downloadable/{orderId} GET接口
- 通过检查Redis键值判断订单是否可下载
- 返回ApiResponse包装的布尔值表示下载状态

src/main/java/com/ycwl/basic/controller/mobile/AppOrderV2Controller.java

@@ -29,6 +29,7 @@ import com.ycwl.basic.order.dto.PaymentParamsResponse;
 import com.ycwl.basic.order.dto.PaymentCallbackResponse;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
+import org.springframework.data.redis.core.RedisTemplate;
 import org.springframework.web.bind.annotation.*;
 
 import jakarta.servlet.http.HttpServletRequest;
@@ -55,6 +56,7 @@ public class AppOrderV2Controller {
     private final VideoTaskRepository videoTaskRepository;
     private final TemplateRepository templateRepository;
     private final VideoRepository videoRepository;
+    private final RedisTemplate<String, Object> redisTemplate;
 
     /**
      * 移动端价格计算
@@ -349,4 +351,9 @@ public class AppOrderV2Controller {
             return "FAIL";
         }
     }
+
+    @GetMapping("/downloadable/{orderId}")
+    public ApiResponse<Boolean> getDownloadableOrder(@PathVariable("orderId") Long orderId) {
+        return ApiResponse.success(!redisTemplate.hasKey("order_content_not_downloadable_" + orderId));
+    }
 }