fix(sdk): add missing session_token field to RpcClientConfig

The middleware-dev agent added session_token to RpcClientConfig
but the SDK client initializer was not updated, breaking the build.

crates/quicproquo-sdk/src/client.rs

@@ -49,6 +49,7 @@ impl QpqClient {
             server_name: self.config.server_name.clone(),
             tls_config: Arc::new(tls_config),
             alpn: self.config.alpn.clone(),
+            session_token: self.session_token.clone(),
         };
 
         let client = quicproquo_rpc::client::RpcClient::connect(rpc_config).await?;