feat(service): expand service layer with new domain operations

- Add IM service modules: audit, channel roles, custom emojis, forum
  tags, integrations, invitations, repo links, slash commands, stages,
  voice, webhooks
- Add PR service modules: review requests, templates
- Add repo service modules: contributors, release assets, git extras
  (archive, branch rename, commit extras, diff/merge, tag, tree)
- Add user service: social (follow/block)
- Add internal auth service
- Update existing service modules with expanded functionality
- Remove deleted IM modules: articles, delivery trace, drafts,
  follows, messages, polls, presence, reactions, threads

service/repo/fork.rs

@@ -8,7 +8,7 @@ use crate::models::repos::{Repo, RepoFork};
 use crate::service::RepoService;
 use crate::session::Session;
 
-use super::util::clamp_limit_offset;
+use super::util::{clamp_limit_offset, set_local_user_id};
 
 #[derive(Debug, Deserialize, Serialize, utoipa::ToSchema)]
 pub struct ForkRepoParams {
@@ -84,8 +84,7 @@ impl RepoService {
             .begin()
             .await
             .map_err(|_| AppError::TxnError)?;
-        sqlx::query("SET LOCAL app.current_user_id = $1")
-            .bind(user_uid)
+        sqlx::query(set_local_user_id(user_uid))
             .execute(&mut *txn)
             .await
             .map_err(AppError::Database)?;
@@ -240,6 +239,65 @@ impl RepoService {
         Ok(fork)
     }
 
+    pub async fn repo_delete_fork(
+        &self,
+        ctx: &Session,
+        wk_name: &str,
+        repo_name: &str,
+    ) -> Result<(), AppError> {
+        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
+        let repo = self.resolve_repo(wk_name, repo_name).await?;
+        if !repo.is_fork {
+            return Err(AppError::BadRequest("repo is not a fork".into()));
+        }
+        self.ensure_repo_role_at_least(user_uid, &repo, Role::Admin)
+            .await?;
+
+        let parent_id = repo
+            .forked_from_repo_id
+            .ok_or(AppError::BadRequest("parent repo not found".into()))?;
+
+        let now = chrono::Utc::now();
+        let mut txn = self
+            .ctx
+            .db
+            .writer()
+            .begin()
+            .await
+            .map_err(|_| AppError::TxnError)?;
+        sqlx::query(set_local_user_id(user_uid))
+            .execute(&mut *txn)
+            .await
+            .map_err(AppError::Database)?;
+
+        sqlx::query("DELETE FROM repo_fork WHERE fork_repo_id = $1")
+            .bind(repo.id)
+            .execute(&mut *txn)
+            .await
+            .map_err(AppError::Database)?;
+
+        sqlx::query(
+            "UPDATE repo SET deleted_at = $1, status = 'deleted', updated_at = $1 WHERE id = $2",
+        )
+        .bind(now)
+        .bind(repo.id)
+        .execute(&mut *txn)
+        .await
+        .map_err(AppError::Database)?;
+
+        sqlx::query(
+            "UPDATE repo_stats SET forks_count = GREATEST(forks_count - 1, 0), updated_at = $1 WHERE repo_id = $2",
+        )
+        .bind(now)
+        .bind(parent_id)
+        .execute(&mut *txn)
+        .await
+        .map_err(AppError::Database)?;
+
+        txn.commit().await.map_err(|_| AppError::TxnError)?;
+        Ok(())
+    }
+
     pub(crate) async fn find_ws_for_repo(
         &self,
         repo: &Repo,