feat(api): resolve trailer chips by TMDB id

crates/arr-api/src/movies.rs

@@ -149,6 +149,9 @@ pub enum ApiError {
     OwnerNotFound,
     PolicyNotFound,
     RootNotFound,
+    /// The §9.6 chip outcome: the title exists upstream but has no trailer.
+    /// Ordinary, so it must stay distinguishable from an upstream failure.
+    NoTrailer,
     Conflict(String),
     Invalid(String),
     Unavailable,
@@ -169,6 +172,7 @@ impl IntoResponse for ApiError {
             Self::OwnerNotFound => (StatusCode::NOT_FOUND, "owner not found".to_string()),
             Self::PolicyNotFound => (StatusCode::NOT_FOUND, "policy not found".to_string()),
             Self::RootNotFound => (StatusCode::NOT_FOUND, "root not found".to_string()),
+            Self::NoTrailer => (StatusCode::NOT_FOUND, "no trailer".to_string()),
             Self::Conflict(error) => (StatusCode::CONFLICT, error),
             Self::Invalid(error) => (StatusCode::UNPROCESSABLE_ENTITY, error),
             Self::Unavailable => (