refactor(quark): port invite_delete, invite_fetch, invite_join

crates/delta/src/routes/invites/mod.rs

@@ -6,5 +6,9 @@ mod invite_fetch;
 mod invite_join;
 
 pub fn routes() -> (Vec<Route>, OpenApi) {
-    openapi_get_routes_spec![invite_fetch::req, invite_join::req, invite_delete::req]
+    openapi_get_routes_spec![
+        invite_fetch::fetch,
+        invite_join::join,
+        invite_delete::delete
+    ]
 }