image-gen: make unused bools in task response optional

crates/lib/api_clients/openai_sora_client/src/image_gen/image_gen_status.rs

@@ -83,16 +83,16 @@ pub struct Generation {
   pub created_at: String,
   pub deleted_at: Option<String>,
   pub url: String,
-  pub seed: i64,
-  pub can_download: bool,
-  pub download_status: String,
-  pub is_favorite: bool,
-  pub is_liked: bool,
-  pub is_public: bool,
-  pub is_archived: bool,
-  pub is_featured: bool,
-  pub has_feedback: bool,
-  pub like_count: i32,
+  pub seed: Option<i64>,
+  pub can_download: Option<bool>,
+  pub download_status: Option<String>,
+  pub is_favorite: Option<bool>,
+  pub is_liked: Option<bool>,
+  pub is_public: Option<bool>,
+  pub is_archived: Option<bool>,
+  pub is_featured: Option<bool>,
+  pub has_feedback: Option<bool>,
+  pub like_count: Option<i32>,
   pub cloudflare_metadata: Option<serde_json::Value>,
   pub cf_thumbnail_url: Option<String>,
   pub encodings: Encodings,