Fix lint-swagger warning (#29787)

Caused by: #23106
Fix:
2264033569

1. Delete `UserBadgeList` in `options.go`, because it wasn't used. (The
struct defined in `options.go` is the struct used to parse the request
body)
2. Move `BadgeList` struct under `routers/api/v1/swagger` folder which
response should be defined in.

modules/structs/user.go

@@ -132,10 +132,3 @@ type UserBadgeOption struct {
 	// example: ["badge1","badge2"]
 	BadgeSlugs []string `json:"badge_slugs" binding:"Required"`
 }
-
-// BadgeList
-// swagger:response BadgeList
-type BadgeList struct {
-	// in:body
-	Body []Badge `json:"body"`
-}