centralize openai responses alias handling

crates/aether-model-fetch/src/logic.rs

@@ -570,11 +570,7 @@ fn wildcard_matches(pattern: &str, model_id: &str) -> bool {
 }
 
 fn normalize_api_format(value: &str) -> String {
-    match value.trim().to_ascii_lowercase().as_str() {
-        "openai:cli" => "openai:responses".to_string(),
-        "openai:compact" => "openai:responses:compact".to_string(),
-        other => other.to_string(),
-    }
+    aether_ai_formats::normalize_legacy_openai_format_alias(value)
 }
 
 #[cfg(test)]