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/src/rpc_service/mod.rs

@@ -1,5 +1,4 @@
 mod acl_manage;
-mod api;
 mod config;
 mod connector_manage;
 mod credential_manage;
@@ -11,6 +10,7 @@ mod proxy;
 mod stats;
 mod vpn_portal;
 
+pub mod api;
 pub mod instance_manage;
 pub mod logger;
 pub mod remote_client;