fix: resolve clippy warnings and rustfmt issues for CI compliance

Fix all clippy lints (collapsible if, clone on Copy, needless borrow,
redundant bindings, unused params) and apply rustfmt across the codebase.
Update test mocks to match Uuid-based trait signatures.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/infrastructure/repositories/pg/trash_db_repository.rs

@@ -64,9 +64,9 @@ impl TrashDbRepository {
         // In the soft-delete model, the trash entry ID is the same as the
         // original item ID since there is no separate trash table.
         TrashedItem::from_raw(
-            id,       // trash entry id (same as original)
-            id,       // original item id
-            user_id,  // owner
+            id,      // trash entry id (same as original)
+            id,      // original item id
+            user_id, // owner
             item_type_enum,
             name.clone(),
             String::new(), // original_path — not stored separately in soft-delete model