feat(cli): add interactive email import tool for EML, MBOX, and Thunderbird

- Implement `bichonctl` interactive CLI using `dialoguer`.
- Support recursive EML directory scanning with folder structure preservation.
- Support single MBOX file streaming import.
- Support Thunderbird profile import with automatic `.sbd` hierarchy detection.
- Add batch processing (Base64 encoding & batch API requests) for improved performance.

src/modules/rest/api/account.rs

@@ -221,10 +221,13 @@ impl AccountApi {
     )]
     async fn minimal_accounts_list(
         &self,
+        only_nosync: Query<Option<bool>>,
         context: ClientContext,
     ) -> ApiResult<Json<Vec<MinimalAccount>>> {
         let is_admin = context.user.is_admin().await;
-        let minimal_list = AccountModel::minimal_list().await?;
+        let only_nosync = only_nosync.0.unwrap_or_default();
+
+        let minimal_list = AccountModel::minimal_list(only_nosync).await?;
         if is_admin {
             return Ok(Json(minimal_list));
         }