fix: apply rustfmt to backend exports for CI

Keep the backend re-export list aligned with rustfmt so cargo fmt --check passes again in CI.

Author: vriesdcrv

src/backend/mod.rs

@@ -4,14 +4,14 @@ mod validation;
 mod workflow;
 
 pub use requests::{
-    CompareExecution, CompareRequest, CompareValidationError, MappingRequest,
-    SessionResponse, SuggestMappingsRequest,
+    CompareExecution, CompareRequest, CompareValidationError, MappingRequest, SessionResponse,
+    SuggestMappingsRequest,
 };
 pub use session::SessionData;
 pub use workflow::{
     apply_csv_to_session, comparison_inputs, export_results_to_bytes,
-    export_session_results_snapshot, parse_file_side, run_comparison,
-    suggest_mappings_workflow, validate_file_letter, write_export_results,
+    export_session_results_snapshot, parse_file_side, run_comparison, suggest_mappings_workflow,
+    validate_file_letter, write_export_results,
 };
 
 #[cfg(test)]