chore: changelog

Author: andogq

.changes/router-refactor.md

@@ -0,0 +1,7 @@
+---
+"qubit": major
+---
+
+**(BREAKING)** Refactor router to separate RPC functionality from type generation functionality.
+Now, use `router.as_codegen().write_type(path, TypeScript::new())` to generate types, and
+`router.as_rpc(ctx).into_service()` to build the service.