fix(editor): support opening files with MIME subtypes via parent type inheritance

- Refactor isMimeTypeSupport() to retain QMimeDatabase and QMimeType objects for further queries
- Replace QStringList stream insertion with initializer list construction
- Add parentMimeTypes() lookup to match MIME subtypes against the whitelist (e.g. application/schema+json → application/json)

修复(editor): 通过父类型继承支持打开 MIME 子类型文件

- 重构 isMimeTypeSupport()，保留 QMimeDatabase 和 QMimeType 对象以供后续查询
- 将 QStringList 的流插入替换为初始化列表构造
- 新增 parentMimeTypes() 查找，将 MIME 子类型与白名单匹配（如 application/schema+json → application/json）

Log: 修复 JSON Schema 等 MIME 子类型文件无法被编辑器打开的问题，通过检查父 MIME 类型继承关系扩展白名单匹配范围
Bug: https://pms.uniontech.com/bug-view-362023.html

Author: zhangjiarui

src/common/utils.cpp

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2011-2023 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2011-2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -539,6 +539,7 @@ bool Utils::isMimeTypeSupport(const QString &filepath)
     textMimeTypes << "application/cmd"
                   << "application/javascript"
                   << "application/json"
+                  << "application/schema+json"
                   << "application/pkix-cert"
                   << "application/octet-stream"
                   << "application/sql"
@@ -564,6 +565,7 @@ bool Utils::isMimeTypeSupport(const QString &filepath)
                   << "application/x-yaml"
                   << "application/x-pem-key"
                   << "application/xml"
+                  << "application/xhtml+xml"
                   << "application/yaml"
                   << "application/x-zerosize"
                   << "image/svg+xml"