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/lib.rs

@@ -71,7 +71,36 @@ pub mod test_utils {
         
         let (dashboard_tx, _) = tokio::sync::broadcast::channel(100);
         
+        let config = Arc::new(crate::config::AppConfig {
+            server: crate::config::ServerConfig {
+                port: 8080,
+                host: "127.0.0.1".to_string(),
+                auth_tokens: vec![],
+            },
+            database: crate::config::DatabaseConfig {
+                path: std::path::PathBuf::from(":memory:"),
+                max_connections: 5,
+            },
+            providers: crate::config::ProviderConfig {
+                openai: crate::config::OpenAIConfig { api_key_env: "OPENAI_API_KEY".to_string(), base_url: "".to_string(), default_model: "".to_string(), enabled: true },
+                gemini: crate::config::GeminiConfig { api_key_env: "GEMINI_API_KEY".to_string(), base_url: "".to_string(), default_model: "".to_string(), enabled: true },
+                deepseek: crate::config::DeepSeekConfig { api_key_env: "DEEPSEEK_API_KEY".to_string(), base_url: "".to_string(), default_model: "".to_string(), enabled: true },
+                grok: crate::config::GrokConfig { api_key_env: "GROK_API_KEY".to_string(), base_url: "".to_string(), default_model: "".to_string(), enabled: true },
+                ollama: crate::config::OllamaConfig { base_url: "".to_string(), enabled: true, models: vec![] },
+            },
+            model_mapping: crate::config::ModelMappingConfig { patterns: vec![] },
+            pricing: crate::config::PricingConfig {
+                openai: vec![],
+                gemini: vec![],
+                deepseek: vec![],
+                grok: vec![],
+                ollama: vec![],
+            },
+            config_path: None,
+        });
+
         Arc::new(AppState {
+            config,
             provider_manager,
             db_pool: pool.clone(),
             rate_limit_manager: Arc::new(rate_limit_manager),