refactor(hero): 重构英雄相关接口和数据结构

- 修改 GetDetailReq 结构体，将 Code 字段改为 HeroCode
- 更新 GetDetailRes 结构体，将 Rarity 字段改为 Stars，类型从 string 改为 int
-调整 EpicHeroVO 结构体，移除 orm 标签，将 Rarity 改为 Stars- 更新相关控制器和逻辑层代码，以适应上述变更

api/hero/v1/hero.go

@@ -20,8 +20,8 @@ type GetListReq struct {
 type GetListRes []*EpicHeroVO
 
 type GetDetailReq struct {
-	g.Meta `path:"/app-api/epic/hero/hero-detail" method:"get" tags:"Hero" summary:"Get hero detail by code"`
-	Code   string `v:"required" dc:"角色code"`
+	g.Meta   `path:"/app-api/epic/hero/hero-detail" method:"get" tags:"Hero" summary:"Get hero detail by code"`
+	HeroCode string `v:"required" dc:"角色code"`
 }
 type GetDetailRes struct {
 	*HeroDetailVO