feat(评论): 添加评论置顶功能

- 在评论表中添加 priority 字段用于控制置顶权重
- 修改所有评论查询接口按 priority 和 created 排序
- 在管理后台添加置顶权重编辑功能
- 在评论列表显示置顶标识

cwd-api/src/api/public/getComments.ts

@@ -13,14 +13,13 @@ export const getComments = async (c: Context<{ Bindings: Bindings }>) => {
   if (!post_slug) return c.json({ message: "post_slug is required" }, 400)
 
   try {
-    // 1. 查询审核通过的评论
     const query = `
       SELECT id, name, email, url, content_text as contentText, 
              content_html as contentHtml, created, parent_id as parentId,
-             post_slug as postSlug
+             post_slug as postSlug, priority
       FROM Comment 
       WHERE post_slug = ? AND status = "approved"
-      ORDER BY created DESC
+      ORDER BY priority DESC, created DESC
     `
     const { results } = await c.env.CWD_DB.prepare(query).bind(post_slug).all()
 
@@ -105,4 +104,4 @@ export const getComments = async (c: Context<{ Bindings: Bindings }>) => {
   } catch (e: any) {
     return c.json({ message: e.message }, 500)
   }
-}
+}