style: fix cargo fmt + clippy violations from TTS merge

- config/mod.rs: reorder TTS imports alphabetically (rustfmt)
- config/schema.rs: collapse single-arg encrypt/decrypt calls (rustfmt)
- main.rs: Box::pin large onboard futures to fix clippy::large_futures

These violations were introduced by the TTS providers merge (#2994)
and are blocking CI lint on all open PRs targeting master.

src/main.rs

@@ -717,9 +717,9 @@ async fn main() -> Result<()> {
             bail!("--channels-only does not accept --force");
         }
         let config = if channels_only {
-            onboard::run_channels_repair_wizard().await
+            Box::pin(onboard::run_channels_repair_wizard()).await
         } else if interactive {
-            onboard::run_wizard(force).await
+            Box::pin(onboard::run_wizard(force)).await
         } else {
             onboard::run_quick_setup(
                 api_key.as_deref(),