feat: Support authenticating or refreshing OAuth for supported clients from within the REPL

src/client/claude.rs

@@ -27,7 +27,7 @@ pub struct ClaudeConfig {
 impl ClaudeClient {
     config_get_fn!(api_key, get_api_key);
     config_get_fn!(api_base, get_api_base);
-    
+
     create_oauth_supported_client_config!();
 }
 
@@ -35,6 +35,10 @@ impl ClaudeClient {
 impl Client for ClaudeClient {
     client_common_fns!();
 
+    fn supports_oauth(&self) -> bool {
+        self.config.auth.as_deref() == Some("oauth")
+    }
+
     async fn chat_completions_inner(
         &self,
         client: &ReqwestClient,

src/client/common.rs

@@ -47,6 +47,10 @@ pub trait Client: Sync + Send {
 
     fn model(&self) -> &Model;
 
+    fn supports_oauth(&self) -> bool {
+        false
+    }
+
     fn build_client(&self) -> Result<ReqwestClient> {
         let mut builder = ReqwestClient::builder();
         let extra = self.extra_config();