[model-gateway] remove grpc feature flag and mark as default

Author: slin1237

sgl-router/Cargo.toml

@@ -4,9 +4,7 @@ version = "0.2.2"
 edition = "2021"
 
 [features]
-default = ["grpc-client"]
-grpc-client = []
-grpc-server = []
+default = []
 vendored-openssl = ["openssl/vendored"]
 
 [lints.rust]

sgl-router/src/lib.rs

@@ -4,7 +4,6 @@ pub mod logging;
 
 pub mod core;
 pub mod data_connector;
-#[cfg(feature = "grpc-client")]
 pub mod grpc_client;
 pub mod mcp;
 pub mod metrics;