style: apply cargo fmt to entire codebase

Standardize code formatting across all 173 Rust source files
using rustfmt. No functional changes - purely cosmetic.

This establishes a consistent code style baseline for the
project going forward.

src/domain/entities/trashed_item.rs

@@ -103,4 +103,4 @@ impl TrashedItem {
         let now = Utc::now();
         (self.deletion_date - now).num_days().max(0)
     }
-}
+}