feat(api): expand API endpoints for repo, PR, user, workspace management

- Add git operation endpoints: archive, compare branches, diff, tree,
  repository extras
- Add repo endpoints: contributors, delete fork, get branch/commit
  status/deploy key/invitation/member/release/tag/webhook, topics,
  release assets, webhook deliveries/retry
- Add PR endpoints: review requests, templates
- Add user endpoints: block/unblock, follow/unfollow, presence,
  personal access tokens, account restore
- Add workspace endpoints: billing history, approvals, domains,
  integrations, invitations, members, webhooks, restore
- Add internal API, notification API, IM API modules
- Update route configuration and OpenAPI spec

api/internal/mod.rs

@@ -0,0 +1,10 @@
+pub mod issue_api_key;
+
+use actix_web::web;
+
+pub fn configure(cfg: &mut web::ServiceConfig) {
+    cfg.service(
+        web::scope("/internal")
+            .route("/api-keys", web::post().to(issue_api_key::issue_api_key)),
+    );
+}