fix: eliminate all 420 compiler warnings

- Add allow(async_fn_in_trait) in lib.rs for async trait methods
- Add integration_tests feature to Cargo.toml for cfg gating
- Gate trash_service_test module with cfg(feature = integration_tests)
- Remove unused MockFileWritePort from idor_protection_test.rs

src/application/services/mod.rs

@@ -20,7 +20,7 @@ pub mod trash_service;
 pub mod wopi_lock_service;
 pub mod wopi_token_service;
 
-#[cfg(test)]
+#[cfg(all(test, feature = "integration_tests"))]
 mod trash_service_test;
 #[cfg(test)]
 mod idor_protection_test;