🎨 Improve the code structure

server/middlewares/account.go

@@ -0,0 +1,16 @@
+package middlewares
+
+import (
+	"fmt"
+	"github.com/Xhofe/alist/model"
+	"github.com/Xhofe/alist/server/common"
+	"github.com/gin-gonic/gin"
+)
+
+func CheckAccount(c *gin.Context) {
+	if model.AccountsCount() == 0 {
+		common.ErrorResp(c, fmt.Errorf("no accounts,please add one first"), 1001)
+		return
+	}
+	c.Next()
+}