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/state/mod.rs

@@ -4,12 +4,13 @@ use tokio::sync::broadcast;
 use crate::{
     client::ClientManager, database::DbPool, providers::ProviderManager,
     rate_limiting::RateLimitManager, logging::RequestLogger,
-    models::registry::ModelRegistry,
+    models::registry::ModelRegistry, config::AppConfig,
 };
 
 /// Shared application state
 #[derive(Clone)]
 pub struct AppState {
+    pub config: Arc<AppConfig>,
     pub provider_manager: ProviderManager,
     pub db_pool: DbPool,
     pub rate_limit_manager: Arc<RateLimitManager>,
@@ -22,6 +23,7 @@ pub struct AppState {
 
 impl AppState {
     pub fn new(
+        config: Arc<AppConfig>,
         provider_manager: ProviderManager,
         db_pool: DbPool,
         rate_limit_manager: RateLimitManager,
@@ -33,6 +35,7 @@ impl AppState {
         let request_logger = Arc::new(RequestLogger::new(db_pool.clone(), dashboard_tx.clone()));
 
         Self {
+            config,
             provider_manager,
             db_pool,
             rate_limit_manager: Arc::new(rate_limit_manager),