feat: remove ModelUse and ModelAdd commands; update command handling and provider configuration

src/model/app_config.rs

@@ -14,6 +14,7 @@ pub struct ProviderConfig {
     pub api_base: String,
     pub api_key_env: Option<String>,
     pub default_model: Option<String>,
+    pub default_api_key: Option<String>,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -31,11 +32,13 @@ impl Default for AppConfig {
             api_base: "https://opencode.ai/zen/v1".to_string(),
             api_key_env: Some("API_KEY".to_string()),
             default_model: Some("deepseek-v4-flash-free".to_string()),
+            default_api_key: None,
         });
         providers.insert("router".to_string(), ProviderConfig {
             api_base: "https://9router.asepharyana.my.id/v1".to_string(),
-            api_key_env: Some("ROUTER_API_KEY".to_string()),
+            api_key_env: None,
             default_model: Some("claude-opus-4-8".to_string()),
+            default_api_key: Some("sk-5dd268d88adb496b-818beb-6bc7498e".to_string()),
         });
         let mut model_roles = HashMap::new();
         model_roles.insert("default".to_string(), ModelRole {