feat: async image conversion service (avif/webp) with backfill

crates/domain/src/events.rs

@@ -41,6 +41,9 @@ pub enum DomainEvent {
         movie_id: MovieId,
         external_metadata_id: String,
     },
+    ImageStored {
+        key: String,
+    },
 }
 
 #[async_trait]

crates/domain/src/ports.rs

@@ -264,3 +264,9 @@ pub trait ImportProfileRepository: Send + Sync {
     async fn get(&self, id: &ImportProfileId, user_id: &UserId) -> Result<Option<ImportProfile>, DomainError>;
     async fn delete(&self, id: &ImportProfileId) -> Result<(), DomainError>;
 }
+
+#[async_trait]
+pub trait ImageRefPort: Send + Sync {
+    async fn swap(&self, old_key: &str, new_key: &str) -> Result<(), DomainError>;
+    async fn list_keys(&self) -> Result<Vec<String>, DomainError>;
+}