feat: 文章属性前端完成 — Phase 3

- 写文章页：可见性/类型/转载来源/创作声明/禁止转载 属性表单
- 类型切换联动（转载显示来源，原创显示禁止转载复选框）
- 文章详情页：私密角标、置顶标记、创作声明横幅、转载来源
- 管理后台：置顶/取消置顶操作按钮
- PostService Create/Update 签名扩展接受文章属性
- DTO/接口同步更新

internal/service/post_service.go

@@ -68,19 +68,24 @@ func (s *PostService) findPostWithAuthor(id uint) (*model.Post, error) {
 // Create 创建帖子
 // body 为 Vditor 输出的 Markdown，后端直接存储不做 HTML 消毒
 // MD 是纯文本，无 XSS 注入风险；前端渲染时由 Vditor 转 HTML
-func (s *PostService) Create(userID uint, title, body string) (*model.Post, error) {
+func (s *PostService) Create(userID uint, title, body string, visibility, postType, reprintSource, declaration string, reprintProhibited bool) (*model.Post, error) {
 	status := model.PostStatusApproved
 	if s.auditEnabled() {
 		status = model.PostStatusDraft
 	}
 
 	post := &model.Post{
-		Title:        title,
-		Body:         body,
-		Excerpt:      generateExcerpt(body),
-		UserID:       userID,
-		Status:       status,
-		AllowComment: true,
+		Title:             title,
+		Body:              body,
+		Excerpt:           generateExcerpt(body),
+		UserID:            userID,
+		Status:            status,
+		AllowComment:      true,
+		Visibility:        visibility,
+		PostType:          postType,
+		ReprintSource:     reprintSource,
+		Declaration:       declaration,
+		ReprintProhibited: reprintProhibited,
 	}
 	if err := s.repo.Create(post); err != nil {
 		return nil, err