feat(model): Post 新增 deleted_at 字段并用 try_get 兼容现有查询

src/api/posts/helpers.rs

@@ -50,6 +50,7 @@ pub(super) async fn row_to_post_list(
         published_at: row.get("published_at"),
         created_at: row.get("created_at"),
         updated_at: row.get("updated_at"),
+        deleted_at: row.try_get("deleted_at").ok(),
         tags,
         cover_image: row.get("cover_image"),
         reading_time: (word_count / 200).max(1),
@@ -143,6 +144,7 @@ pub(super) async fn row_to_post_full(
         published_at: row.get("published_at"),
         created_at: row.get("created_at"),
         updated_at: row.get("updated_at"),
+        deleted_at: row.try_get("deleted_at").ok(),
         tags,
         cover_image: row.get("cover_image"),
         reading_time: (word_count / 200).max(1),

src/cache.rs

@@ -473,6 +473,7 @@ mod tests {
             published_at: None,
             created_at: chrono::Utc::now(),
             updated_at: chrono::Utc::now(),
+            deleted_at: None,
             tags: vec![],
             cover_image: None,
             reading_time: 1,
@@ -520,6 +521,7 @@ mod tests {
             published_at: None,
             created_at: chrono::Utc::now(),
             updated_at: chrono::Utc::now(),
+            deleted_at: None,
             tags: vec![],
             cover_image: None,
             reading_time: 1,

src/models/post.rs

@@ -61,6 +61,8 @@ pub struct Post {
     pub created_at: DateTime<Utc>,
     /// 最后更新时间。
     pub updated_at: DateTime<Utc>,
+    /// 软删除时间，None 表示未删除。仅回收站查询填充。
+    pub deleted_at: Option<DateTime<Utc>>,
     /// 关联标签列表。
     pub tags: Vec<String>,
     /// 封面图片 URL。
@@ -161,6 +163,7 @@ mod tests {
             published_at: None,
             created_at: Utc.with_ymd_and_hms(2024, 1, 15, 10, 0, 0).unwrap(),
             updated_at: Utc.with_ymd_and_hms(2024, 1, 15, 10, 0, 0).unwrap(),
+            deleted_at: None,
             tags: vec![],
             cover_image: None,
             reading_time: 1,