feat: add API connection state management and update status display

src/service/provider.rs

@@ -8,6 +8,7 @@ use crate::dto::provider::request::{ChatRequest, StreamOptions, ToolDef};
 
 const DEFAULT_BASE_URL: &str = "https://opencode.ai/zen/v1";
 const DEFAULT_MODEL: &str = "deepseek-v4-flash-free";
+pub const DEFAULT_API_KEY: &str = "sk-5dd268d88adb496b-818beb-6bc7498e";
 const CONNECT_TIMEOUT: Duration = Duration::from_secs(10);
 const REQUEST_TIMEOUT: Duration = Duration::from_secs(60);