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/movies/tests/get_movie_profile.rs

@@ -0,0 +1,92 @@
+use std::sync::Arc;
+
+use chrono::Utc;
+use uuid::Uuid;
+
+use domain::{
+    models::{CastMember, CrewMember, MovieProfile},
+    ports::MovieProfileRepository,
+    testing::InMemoryMovieProfileRepository,
+    value_objects::MovieId,
+};
+
+use crate::{
+    movies::get_movie_profile::{self, GetMovieProfileQuery},
+    test_helpers::TestContextBuilder,
+};
+
+#[tokio::test]
+async fn returns_none_when_no_profile() {
+    let ctx = TestContextBuilder::new().build();
+
+    let result = get_movie_profile::execute(
+        &ctx,
+        GetMovieProfileQuery {
+            movie_id: Uuid::new_v4(),
+        },
+    )
+    .await
+    .unwrap();
+
+    assert!(result.is_none());
+}
+
+#[tokio::test]
+async fn returns_profile_with_cast_and_crew() {
+    let profile_repo = InMemoryMovieProfileRepository::new();
+    let movie_id = MovieId::generate();
+
+    let profile = MovieProfile {
+        movie_id: movie_id.clone(),
+        tmdb_id: 42,
+        imdb_id: Some("tt1234567".into()),
+        overview: Some("A great movie".into()),
+        tagline: None,
+        runtime_minutes: Some(120),
+        budget_usd: None,
+        revenue_usd: None,
+        vote_average: Some(8.0),
+        vote_count: Some(500),
+        original_language: Some("en".into()),
+        collection_name: None,
+        genres: vec![],
+        keywords: vec![],
+        cast: vec![CastMember {
+            tmdb_person_id: 1,
+            name: "Alice".into(),
+            character: "Hero".into(),
+            billing_order: 0,
+            profile_path: None,
+        }],
+        crew: vec![CrewMember {
+            tmdb_person_id: 2,
+            name: "Bob".into(),
+            job: "Director".into(),
+            department: "Directing".into(),
+            profile_path: None,
+        }],
+        enriched_at: Utc::now(),
+    };
+    profile_repo.upsert(&profile).await.unwrap();
+
+    let ctx = TestContextBuilder::new()
+        .with_movie_profiles(Arc::clone(&profile_repo) as _)
+        .build();
+
+    let result = get_movie_profile::execute(
+        &ctx,
+        GetMovieProfileQuery {
+            movie_id: movie_id.value(),
+        },
+    )
+    .await
+    .unwrap();
+
+    let res = result.expect("profile should be present");
+    assert_eq!(res.cast.len(), 1);
+    assert_eq!(res.cast[0].name, "Alice");
+    assert_eq!(res.cast[0].character, "Hero");
+    assert_eq!(res.crew.len(), 1);
+    assert_eq!(res.crew[0].name, "Bob");
+    assert_eq!(res.crew[0].job, "Director");
+}