feat(application): add DeleteReviewCommand and delete_review use case

crates/application/src/use_cases/delete_review.rs

@@ -0,0 +1,27 @@
+use domain::{errors::DomainError, value_objects::{ReviewId, UserId}};
+use crate::{commands::DeleteReviewCommand, context::AppContext};
+
+pub async fn execute(ctx: &AppContext, cmd: DeleteReviewCommand) -> Result<(), DomainError> {
+    let review_id = ReviewId::from_uuid(cmd.review_id);
+    let requesting_user_id = UserId::from_uuid(cmd.requesting_user_id);
+
+    let review = ctx
+        .repository
+        .get_review_by_id(&review_id)
+        .await?
+        .ok_or_else(|| DomainError::NotFound(format!("review {}", cmd.review_id)))?;
+
+    if review.user_id() != &requesting_user_id {
+        return Err(DomainError::Unauthorized("not your review".into()));
+    }
+
+    let movie_id = review.movie_id().clone();
+    ctx.repository.delete_review(&review_id).await?;
+
+    let history = ctx.repository.get_review_history(&movie_id).await?;
+    if history.viewings().is_empty() {
+        ctx.repository.delete_movie(&movie_id).await?;
+    }
+
+    Ok(())
+}