Introduce remote object references (refId) and deep proxy support across client, server, serializer and types. Key changes:
- Add refId propagation in client proxies so child proxies inherit and include refId on RPC requests.
- Extend serializer to handle a new SerializedValueType.OBJECT_REF, add refResolver and pass refId to proxyCreator.
- Server: store object references in a Map with generated ref IDs, resolve paths with optional refId, serialize results to OBJECT_REF when shouldProxyResult returns true, and release cleans up references. Add defaultShouldProxyResult heuristic to decide which return values should remain proxied (class instances and objects with methods).
- Types: add refId fields and ObjectRef shape, expose shouldProxyResult option on RpcServerOptions, and include refId in ProxyMeta and serialized values.
- Tests updated across the suite to expect proxied return values (arrays/objects/class instances) and to await property access or method calls; add comprehensive tests for deep return value proxying, chained calls, callbacks, constructors on returned proxies, and lifecycle of remote object proxies.
These changes enable returning live/proxied remote objects (including class instances and objects with methods) from RPC calls, preserving remote behavior and allowing subsequent operations to target the same server-side object.
Introduce a new napcat-rpc package implementing a deep-proxy RPC system. Adds client (createDeepProxy, proxy helpers), server (RpcServer, createRpcServer), serializer (serialize/deserialize, callback registry), and transport layers (LocalTransport, MessageTransport, message server handler), plus an easy API (createRpcPair, mockRemote, createServer, createClient). Includes TypeScript types, tsconfig and package.json. Wire-up: add package alias in napcat-schema vite config and add napcat-rpc dependency to napcat-test along with comprehensive rpc tests.
