chore: add theme validation

controller/option.go

@@ -42,6 +42,14 @@ func UpdateOption(c *gin.Context) {
 		return
 	}
 	switch option.Key {
+	case "Theme":
+		if !common.ValidThemes[option.Value] {
+			c.JSON(http.StatusOK, gin.H{
+				"success": false,
+				"message": "无效的主题",
+			})
+			return
+		}
 	case "GitHubOAuthEnabled":
 		if option.Value == "true" && common.GitHubClientId == "" {
 			c.JSON(http.StatusOK, gin.H{