chore: 工具链升级到最新版本（Vite 8 / React 19 / react-router 8 / TS 7 / Go 1.26 依赖更新）

- 前端：vite ^8.2.2、react/react-dom ^19.2.8、react-router ^8.3.1（移除 react-router-dom）、typescript ^7.0.2、zustand ^5.0.15；适配升级带来的类型变化（react-hook-form Resolver、ProseMirror node.parent、tiptap focus 参数、timer undefined 等）
- 后端：升级 gin/jwt/minio-go/gorm/modernc-sqlite/x-crypto 等直接依赖至最新；gowebp v0.1.1 已是最新版本
- tsconfig 移除 baseUrl，paths 改为相对路径以兼容 TS7

frontend/src/components/ArticleEditor.tsx

@@ -268,13 +268,16 @@ const ArticleEditor = forwardRef<ArticleEditorHandle, Props>(function ArticleEdi
       ImageGroup,
       Placeholder.configure({
         placeholder: ({ node }) => {
-          if (node.type.name === 'paragraph' && node.parent?.type.name === 'membersOnly') {
+          // prosemirror 未公开 parent 字段，这里仅读父节点类型名
+          const parentName = (node as unknown as { parent?: { type?: { name?: string } } })
+            .parent?.type?.name;
+          if (node.type.name === 'paragraph' && parentName === 'membersOnly') {
             return MEMBERS_ONLY_PLACEHOLDER;
           }
-          if (node.type.name === 'paragraph' && node.parent?.type.name === 'replyOnly') {
+          if (node.type.name === 'paragraph' && parentName === 'replyOnly') {
             return REPLY_ONLY_PLACEHOLDER;
           }
-          if (node.type.name === 'paragraph' && node.parent?.type.name === 'pointsOnly') {
+          if (node.type.name === 'paragraph' && parentName === 'pointsOnly') {
             return '此处内容需积分解锁后可见…';
           }
           return placeholder;