1.1.1版本审核修复

[spine-utils.js (line 35)](/Users/tianmokeji/Desktop/特效/SpineViewer/SpineViewer/js/spine-utils.js:35) 统一拦截绝对路径、..、Windows 盘符、UNC、URI、控制字符和符号链接越界。
跨素材贴图只能使用已枚举、验证且位于 Eagle 素材目录内的文件。
[spine-render.js (line 62)](/Users/tianmokeji/Desktop/特效/SpineViewer/SpineViewer/js/spine-render.js:62) 已删除未经验证的路径备用拼接。
自动缩略图只写当前回调提供的 dest，不再调用接口改写同组素材。
已删除后台整组补刷进程及 relatedDataPaths。
[viewer/spine.html (line 482)](/Users/tianmokeji/Desktop/特效/SpineViewer/SpineViewer/viewer/spine.html:482) 的手动缩略图只针对当前素材，并核对素材 ID、文件名和扩展名。
当前素材已有自定义缩略图时，会提示替换后无法自动恢复并要求确认。
手动生成的中间文件改存系统临时目录，API 失败时不再直接写 Eagle 素材目录。
八种语言文案及 README 已同步。
处理历史日志遗留问题

_locales/en.json

@@ -18,8 +18,8 @@
         "pmaTitle": "For textures exported with Premultiplied Alpha (PMA)",
         "background": "Background",
         "backgroundTitle": "50×50 checkerboard that pans and zooms with the canvas and participates in blend modes",
-        "thumbnail": "Set thumbnail",
-        "thumbnailTitle": "Generate a 400×400 thumbnail from the current frame",
+        "thumbnail": "Set current item thumbnail",
+        "thumbnailTitle": "Set the current frame as this item's 400×400 custom thumbnail",
         "versionTitle": "Spine version",
         "reloadTitle": "Reload folder",
         "animationList": "Animation list",
@@ -54,6 +54,8 @@
         "apiHttp": "Eagle API returned HTTP {status}",
         "noSkeletonForThumb": "No skeleton loaded; cannot generate a thumbnail",
         "noItemId": "Cannot determine the Eagle item ID from the asset path",
+        "itemMismatch": "The preview file does not match the Eagle item; the thumbnail update was cancelled",
+        "replaceCustomThumbnailConfirm": "This item already has a custom thumbnail. Continuing will replace it, and the plugin cannot automatically restore the previous image. Continue?",
         "thumbnailFailed": "Failed to generate the thumbnail: {error}",
         "imageLoadFailed": "Failed to load the image",
         "settingsNotReady": "Asset settings are not ready",