feat(web): full-power RPC access + typed JSON proxy endpoint (#1983)

- extend web controller bindings to cover full RPC service set
- update rpc_service API wiring and session/controller integration
- generate trait-level json_call_method in rpc codegen
- route restful proxy-rpc requests via scoped typed clients
- add json-call regression tests and required Sync bound fixes~

easytier-web/src/restful/mod.rs

@@ -2,6 +2,7 @@ mod auth;
 pub(crate) mod captcha;
 mod network;
 pub(crate) mod oidc;
+mod rpc;
 mod users;
 
 use std::{net::SocketAddr, sync::Arc};
@@ -248,6 +249,7 @@ impl RestfulServer {
             .route("/api/v1/summary", get(Self::handle_get_summary))
             .route("/api/v1/sessions", get(Self::handle_list_all_sessions))
             .merge(NetworkApi::build_route())
+            .merge(rpc::router())
             .route_layer(login_required!(Backend))
             .merge(auth::router().layer(Extension(self.feature_flags.clone())))
             .merge(oidc::router())