Introduce brightstaff a new terminal service for llm routing (#477)

crates/brightstaff/src/router/router_model.rs

@@ -0,0 +1,15 @@
+use common::api::open_ai::{ChatCompletionsRequest, Message};
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum RoutingModelError {
+    #[error("Failed to parse JSON: {0}")]
+    JsonError(#[from] serde_json::Error),
+}
+
+pub type Result<T> = std::result::Result<T, RoutingModelError>;
+
+pub trait RouterModel: Send + Sync {
+    fn generate_request(&self, messages: &[Message]) -> ChatCompletionsRequest;
+    fn parse_response(&self, content: &str) -> Result<Option<String>>;
+}