fix: Set tokio runtime to current_thread to fix !Send errors

Co-authored-by: aider (gemini/gemini-2.5-pro-preview-05-06) <aider@aider.chat>

src/main.rs

@@ -32,7 +32,7 @@ fn ensure_config() {
     }
 }
 
-#[tokio::main]
+#[tokio::main(flavor = "current_thread")]
 async fn main() {
     // 🔄 Ensure there's always a config.json present
     ensure_config();