add 400+ unit tests for domain and application layers

Extract ReviewLogger trait to decouple import/integrations
from diary::log_review (cross-module coupling smell).

Add in-memory fakes for all repository ports, enabling
isolated testing of every use case module without a database.

Coverage: domain+application 22% → 80%, 427 tests.

crates/application/src/context.rs

@@ -11,6 +11,7 @@ use domain::ports::{
 };
 
 use crate::config::AppConfig;
+use crate::ports::ReviewLogger;
 
 #[derive(Clone)]
 pub struct Repositories {
@@ -49,6 +50,7 @@ pub struct Services {
     pub event_publisher: Arc<dyn EventPublisher>,
     pub diary_exporter: Arc<dyn DiaryExporter>,
     pub document_parser: Arc<dyn DocumentParser>,
+    pub review_logger: Arc<dyn ReviewLogger>,
 }
 
 #[derive(Clone)]