Improve Codex model fetching

apps/aether-gateway/src/handlers/admin/provider/query/models.rs

@@ -67,6 +67,21 @@ struct ProviderQueryKeyFetchResult {
     has_success: bool,
 }
 
+fn provider_query_codex_preset_fallback(
+    provider: &StoredProviderCatalogProvider,
+) -> Option<ProviderQueryKeyFetchResult> {
+    if !provider.provider_type.trim().eq_ignore_ascii_case("codex") {
+        return None;
+    }
+    let models = preset_models_for_provider(&provider.provider_type)?;
+    Some(ProviderQueryKeyFetchResult {
+        models: aggregate_models_for_cache(&models),
+        error: None,
+        from_cache: false,
+        has_success: true,
+    })
+}
+
 #[derive(Debug, Clone)]
 struct ProviderQueryTestCandidate {
     endpoint: StoredProviderCatalogEndpoint,
@@ -1664,6 +1679,9 @@ async fn provider_query_fetch_models_for_key(
         Ok(outcome) => outcome,
         Err(err) => {
             all_errors.push(err);
+            if let Some(fallback) = provider_query_codex_preset_fallback(provider) {
+                return Ok(fallback);
+            }
             return Ok(ProviderQueryKeyFetchResult {
                 models: Vec::new(),
                 error: Some(all_errors.join("; ")),
@@ -1685,6 +1703,12 @@ async fn provider_query_fetch_models_for_key(
         .await;
     }
 
+    if unique_models.is_empty() && !all_errors.is_empty() {
+        if let Some(fallback) = provider_query_codex_preset_fallback(provider) {
+            return Ok(fallback);
+        }
+    }
+
     let mut error = if all_errors.is_empty() {
         None
     } else {