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

[slin1237]

Checklist

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[gemini-code-assist]

Summary of Changes

Hello @slin1237, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request streamlines the sgl-router crate's configuration by eliminating the explicit grpc-client feature flag. By making gRPC client functionality a default inclusion, it simplifies the build process and ensures that this core capability is always present without requiring specific feature activation.

Highlights

• Feature Flag Removal: The grpc-client and grpc-server feature flags have been entirely removed from the sgl-router/Cargo.toml file, simplifying the build configuration.
• Default gRPC Client: The grpc_client module in sgl-router/src/lib.rs is no longer conditionally compiled based on the grpc-client feature flag, making gRPC client functionality a default and always-available component.

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[gemini-code-assist]

Code Review

This pull request removes the grpc-client and grpc-server feature flags, making gRPC support a core, non-optional component of the sglang-router crate. The changes in Cargo.toml correctly remove the feature definitions, and the change in sgl-router/src/lib.rs removes the conditional compilation for the grpc_client module. These changes are straightforward and correctly implement the goal of making gRPC support integral to the router. The code is clean and I have not found any issues with this change.