refactor(settings): rename update_flag_strategy to version_grouping with migration

locales/zh-CN.json

@@ -332,7 +332,7 @@
             "extraFolderPaths": "额外文件夹路径",
             "downloadPathTemplates": "下载路径模板",
             "priorityTags": "优先标签",
-            "updateFlags": "更新标记",
+            "versionScope": "版本范围",
             "exampleImages": "示例图片",
             "autoOrganize": "自动整理",
             "metadata": "元数据",
@@ -595,12 +595,12 @@
             "download": "下载",
             "restartRequired": "需要重启"
         },
-        "updateFlagStrategy": {
-            "label": "更新标记策略",
-            "help": "决定更新徽章是否仅在新版本与本地文件共享相同基础模型时显示，或只要该模型有任何更新版本就显示。",
+        "versionGrouping": {
+            "label": "版本分组",
+            "help": "控制版本在 UI 中的分组方式：按基础模型分组或合并显示。同时影响更新徽章逻辑和版本列表的筛选行为。",
             "options": {
-                "sameBase": "按基础模型匹配更新",
-                "any": "显示任何可用更新"
+                "sameBase": "按基础模型分组",
+                "any": "显示所有版本"
             }
         },
         "hideEarlyAccessUpdates": {