refactor(models): update data models and remove deprecated IM entities

- Update channel, notification, PR, repo, user, workspace models
- Remove deleted IM models: articles, channel follows, message
  attachments/bookmarks/drafts/edit history/embeds/mentions/pins/
  polls/reactions/threads, saved messages, thread read states
- Add new PR models: review requests, templates
- Add repo release assets model
- Add base_info module for API detail responses

models/users/user.rs

@@ -19,4 +19,8 @@ pub struct User {
     pub created_at: DateTime<Utc>,
     pub updated_at: DateTime<Utc>,
     pub deleted_at: Option<DateTime<Utc>>,
+    #[sqlx(default)]
+    pub restore_token_hash: Option<String>,
+    #[sqlx(default)]
+    pub restore_token_expires_at: Option<DateTime<Utc>>,
 }