fix: real AP id tests, exact poster key check, exists port, list_movies fake

crates/adapters/object-storage/src/lib.rs

@@ -82,6 +82,14 @@ impl ObjectStorage for ObjectStorageAdapter {
         Ok(Box::pin(stream))
     }
 
+    async fn exists(&self, key: &str) -> Result<bool, DomainError> {
+        match self.store.head(&Path::from(key)).await {
+            Ok(_) => Ok(true),
+            Err(object_store::Error::NotFound { .. }) => Ok(false),
+            Err(e) => Err(DomainError::InfrastructureError(e.to_string())),
+        }
+    }
+
     async fn delete(&self, key: &str) -> Result<(), DomainError> {
         let path = Path::from(key);
         match self.store.delete(&path).await {