[router] add get server info and get model info in grpc server (#11303)

sgl-router/src/grpc_client/sglang_scheduler.rs

@@ -97,6 +97,30 @@ impl SglangSchedulerClient {
         Ok(())
     }
 
+    /// Get model information
+    pub async fn get_model_info(
+        &mut self,
+    ) -> Result<proto::GetModelInfoResponse, Box<dyn std::error::Error + Send + Sync>> {
+        debug!("Requesting model info");
+        let request = Request::new(proto::GetModelInfoRequest {});
+
+        let response = self.client.get_model_info(request).await?;
+        debug!("Model info response received");
+        Ok(response.into_inner())
+    }
+
+    /// Get server information
+    pub async fn get_server_info(
+        &mut self,
+    ) -> Result<proto::GetServerInfoResponse, Box<dyn std::error::Error + Send + Sync>> {
+        debug!("Requesting server info");
+        let request = Request::new(proto::GetServerInfoRequest {});
+
+        let response = self.client.get_server_info(request).await?;
+        debug!("Server info response received");
+        Ok(response.into_inner())
+    }
+
     /// Build a single SGLang GenerateRequest from OpenAI ChatCompletionRequest
     pub fn build_generate_request(
         &self,