Function generate_client_stub 

pub fn generate_client_stub(service: &ServiceDef) -> Result<TokenStream>

Generate client stub for a service

Generated clients accept a SynClient (unified connection pool) instead of creating their own. This allows efficient connection reuse across all service clients.

Example output:

pub struct UserServiceClient {
    client: synapse_sdk::SynClient,
}

impl UserServiceClient {
    pub fn new(client: synapse_sdk::SynClient) -> Self { ... }
    pub async fn get_user(&self, request: GetUserRequest) -> Result<GetUserResponse> { ... }
}