fix: enable xAI (Grok) by default and improve provider visibility in dashboard

- Set Grok to enabled: true by default.
- Updated AppState to include raw AppConfig.
- Refactored dashboard to show all supported providers, including their configuration and initialization status (online, disabled, or error).

src/main.rs

@@ -113,7 +113,7 @@ async fn main() -> Result<()> {
     };
     
     // Create application state
-    let state = AppState::new(provider_manager, db_pool, rate_limit_manager, model_registry, config.server.auth_tokens.clone());
+    let state = AppState::new(config.clone(), provider_manager, db_pool, rate_limit_manager, model_registry, config.server.auth_tokens.clone());
 
     // Create application router
     let app = Router::new()