feat: implement on_app_start to set default exchange rate adapter in settings

src-tauri/src/services/exchange_rate/service.rs

@@ -138,7 +138,31 @@ impl ExchangeRateServiceImpl {
     }
 }
 
-impl ServiceTrait for ExchangeRateServiceImpl {}
+#[async_trait::async_trait]
+impl ServiceTrait for ExchangeRateServiceImpl {
+    async fn on_app_start(&self) -> CommandResult<()> {
+        // Ensure the default adapter is set in settings if not already set
+        let current_adapter = self
+            .settings_service
+            .get_setting(
+                &Self::get_settings_key(EXCHANGE_ADAPTER_SETTING_KEY),
+                DEFAULT_ADAPTER_NAME,
+            )
+            .await;
+
+        if current_adapter.is_empty() {
+            self.settings_service
+                .update_setting(
+                    Self::get_settings_key(EXCHANGE_ADAPTER_SETTING_KEY),
+                    DEFAULT_ADAPTER_NAME.to_string(),
+                    None,
+                )
+                .await?;
+        }
+
+        Ok(())
+    }
+}
 
 #[async_trait::async_trait]
 impl ExchangeRateService for ExchangeRateServiceImpl {