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

crates/domain/src/testing/fakes/noops.rs

@@ -61,6 +61,10 @@ impl ObjectStorage for NoopObjectStorage {
     async fn delete(&self, _key: &str) -> Result<(), DomainError> {
         Ok(())
     }
+
+    async fn exists(&self, _key: &str) -> Result<bool, DomainError> {
+        Ok(true)
+    }
 }
 
 // Re-export production noop types so test code that imports from