Unify error handling and HTTP statuses

Signed-off-by: Sean Du <do4suki@gmail.com>

internal/handler/api/livese/info.go

@@ -2,6 +2,7 @@ package livese
 
 import (
 	liveseapischema "honoka-chan/internal/schema/api/livese"
+	"net/http"
 	"time"
 )
 
@@ -10,7 +11,7 @@ func LiveSeInfo() (res any, err error) {
 		Result: liveseapischema.InfoData{
 			LiveSeList: []int{1, 2, 3},
 		},
-		Status:     200,
+		Status:     http.StatusOK,
 		CommandNum: false,
 		TimeStamp:  time.Now().Unix(),
 	}