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

templates/MetaLab-2026/static/js/studio-editor.js

@@ -98,6 +98,16 @@ document.addEventListener('DOMContentLoaded', () => {
 
     document.getElementById('postForm')?.addEventListener('submit', handleSubmit)
 
+    // 类型切换联动：转载→显示来源，原创→显示禁止转载
+    const typeRadios = document.querySelectorAll('input[name="post_type"]')
+    const reprintSourceArea = document.getElementById('reprintSourceArea')
+    const reprintProhibitArea = document.getElementById('reprintProhibitArea')
+    typeRadios.forEach(r => r.addEventListener('change', () => {
+        const isReprint = document.querySelector('input[name="post_type"]:checked')?.value === 'reprint'
+        if (reprintSourceArea) reprintSourceArea.style.display = isReprint ? '' : 'none'
+        if (reprintProhibitArea) reprintProhibitArea.style.display = isReprint ? 'none' : ''
+    }))
+
     if (!isLocked) {
         document.addEventListener('keydown', (e) => {
             if ((e.ctrlKey || e.metaKey) && e.key === 's') {
@@ -174,6 +184,13 @@ async function handleSubmit(e) {
         const body = vditor ? vditor.getValue() : ''
         if (!body.trim()) { showToast('请输入正文', 'warning'); return }
 
+        // 读取文章属性
+        const visibility = document.querySelector('input[name="visibility"]:checked')?.value || 'public'
+        const postType = document.querySelector('input[name="post_type"]:checked')?.value || 'original'
+        const reprintSource = document.getElementById('reprintSource')?.value.trim() || ''
+        const declaration = document.getElementById('declaration')?.value || ''
+        const reprintProhibited = document.getElementById('reprintProhibited')?.checked || false
+
         const isEdit = !!postId
         const url = isEdit ? '/api/studio/posts/' + postId : '/api/studio/posts'
         const method = isEdit ? 'PUT' : 'POST'
@@ -184,7 +201,13 @@ async function handleSubmit(e) {
                 'Content-Type': 'application/json',
                 'X-CSRF-Token': getCSRFToken(),
             },
-            body: JSON.stringify({ title, body }),
+            body: JSON.stringify({
+                title, body,
+                visibility, post_type: postType,
+                reprint_source: reprintSource,
+                declaration,
+                reprint_prohibited: reprintProhibited,
+            }),
         })
         const data = await resp.json()