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/issues/mod.rs

@@ -15,9 +15,9 @@ pub mod issue_stats;
 pub mod issue_subscribers;
 pub mod issue_templates;
 
-pub use issue::Issue;
+pub use issue::{Issue, IssueDetail};
 pub use issue_assignees::IssueAssignee;
-pub use issue_comments::IssueComment;
+pub use issue_comments::{IssueComment, IssueCommentDetail};
 pub use issue_commit_relations::IssueCommitRelation;
 pub use issue_events::IssueEvent;
 pub use issue_label_relations::IssueLabelRelation;