Unify error handling and HTTP statuses

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

internal/handler/api/unit/supporterall.go

@@ -2,6 +2,7 @@ package unit
 
 import (
 	unitapischema "honoka-chan/internal/schema/api/unit"
+	"net/http"
 	"time"
 )
 
@@ -10,7 +11,7 @@ func unitSupporterAll() (res any, err error) {
 		Result: unitapischema.SupporterAllData{
 			UnitSupportList: []unitapischema.SupporterList{},
 		}, // 练习道具
-		Status:     200,
+		Status:     http.StatusOK,
 		CommandNum: false,
 		TimeStamp:  time.Now().Unix(),
 	}