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

crates/application/src/use_cases/sync_poster.rs

@@ -1,5 +1,6 @@
 use domain::{
     errors::DomainError,
+    events::DomainEvent,
     value_objects::{ExternalMetadataId, MovieId, PosterPath},
 };
 
@@ -39,6 +40,14 @@ pub async fn execute(ctx: &AppContext, cmd: SyncPosterCommand) -> Result<(), Dom
         .image_storage
         .store(&movie_id.value().to_string(), &image_bytes)
         .await?;
+
+    if let Err(e) = ctx.event_publisher
+        .publish(&DomainEvent::ImageStored { key: stored_path.clone() })
+        .await
+    {
+        tracing::warn!("failed to emit ImageStored for {stored_path}: {e}");
+    }
+
     let poster_path = PosterPath::new(stored_path)?;
 
     movie.update_poster(poster_path);

crates/application/src/use_cases/update_profile.rs

@@ -27,6 +27,14 @@ pub async fn execute(ctx: &AppContext, cmd: UpdateProfileCommand) -> Result<(),
         }
         let key = format!("avatars/{}", user_id.value());
         let stored = ctx.image_storage.store(&key, &bytes).await?;
+
+        if let Err(e) = ctx.event_publisher
+            .publish(&DomainEvent::ImageStored { key: stored.clone() })
+            .await
+        {
+            tracing::warn!("failed to emit ImageStored for {stored}: {e}");
+        }
+
         Some(stored)
     } else {
         user.avatar_path().map(|s| s.to_string())

crates/application/src/worker.rs

@@ -97,6 +97,7 @@ mod tests {
                 DomainEvent::MovieDeleted { .. } => "movie_deleted",
                 DomainEvent::UserUpdated { .. } => "user_updated",
                 DomainEvent::MovieEnrichmentRequested { .. } => "movie_enrichment_requested",
+                DomainEvent::ImageStored { .. } => "image_stored",
             };
             self.calls.lock().unwrap().push(label);
             Ok(())