Normalize endpoint API root handling

apps/aether-gateway/src/tests/ai_execute/sync/chat/failover.rs

@@ -378,7 +378,7 @@ async fn gateway_skips_unsupported_local_openai_chat_sync_candidate_before_tryin
     );
     assert_eq!(
         seen_execution_runtime_request.url,
-        "https://api.openai.backup.example/v1/chat/completions"
+        "https://api.openai.backup.example/chat/completions"
     );
     assert_eq!(
         seen_execution_runtime_request.model,
@@ -1115,7 +1115,7 @@ async fn gateway_retries_next_local_openai_chat_sync_candidate_after_auth_failur
     );
     assert_eq!(
         seen_execution_runtime_requests[0].url,
-        "https://api.openai.primary.example/v1/chat/completions"
+        "https://api.openai.primary.example/chat/completions"
     );
     assert_eq!(
         seen_execution_runtime_requests[0].authorization,
@@ -1123,7 +1123,7 @@ async fn gateway_retries_next_local_openai_chat_sync_candidate_after_auth_failur
     );
     assert_eq!(
         seen_execution_runtime_requests[1].url,
-        "https://api.openai.backup.example/v1/chat/completions"
+        "https://api.openai.backup.example/chat/completions"
     );
     assert_eq!(
         seen_execution_runtime_requests[1].model,

apps/aether-gateway/src/tests/ai_execute/sync/chat/local_decision.rs

@@ -233,7 +233,7 @@ async fn proxy_pii_redaction_local_openai_chat_runtime_masks_headers_and_restore
     let seen_provider_request = Arc::new(Mutex::new(None::<SeenProviderRequest>));
     let seen_provider_request_clone = Arc::clone(&seen_provider_request);
     let provider_app = Router::new().route(
-        "/v1/chat/completions",
+        "/chat/completions",
         any(move |request: Request| {
             let seen_provider_request_inner = Arc::clone(&seen_provider_request_clone);
             async move {
@@ -491,7 +491,7 @@ async fn gateway_executes_openai_chat_sync_via_local_decision_gate_without_execu
         )
         .expect("endpoint should build")
         .with_transport_fields(
-            "https://api.openai.example".to_string(),
+            "https://api.openai.example/v1".to_string(),
             None,
             None,
             Some(2),
@@ -669,7 +669,7 @@ async fn gateway_executes_openai_chat_sync_via_local_decision_gate_without_execu
     let (upstream_url, upstream_handle) = start_server(upstream).await;
     let (provider_url, provider_handle) = start_server(provider).await;
     let mut primary_endpoint = sample_provider_catalog_endpoint();
-    primary_endpoint.base_url = provider_url.clone();
+    primary_endpoint.base_url = format!("{provider_url}/v1");
     let provider_catalog_repository = Arc::new(InMemoryProviderCatalogReadRepository::seed(
         vec![sample_provider_catalog_provider(), backup_provider],
         {
@@ -871,7 +871,7 @@ async fn gateway_executes_openai_chat_sync_with_regex_model_mapping_in_execution
         )
         .expect("endpoint should build")
         .with_transport_fields(
-            "https://api.openai.example".to_string(),
+            "https://api.openai.example/v1".to_string(),
             None,
             None,
             Some(2),

apps/aether-gateway/src/tests/ai_execute/sync/chat/pii_redaction.rs

@@ -308,7 +308,7 @@ async fn run_sync_redaction_case_with_system_config(
     let seen_provider_request = Arc::new(Mutex::new(None::<SeenProviderRequest>));
     let seen_provider_request_clone = Arc::clone(&seen_provider_request);
     let provider_app = Router::new().route(
-        "/v1/chat/completions",
+        "/chat/completions",
         any(move |request: Request| {
             let seen_provider_request_inner = Arc::clone(&seen_provider_request_clone);
             async move {
@@ -631,7 +631,7 @@ async fn ai_execute_pii_redaction_restores_executed_candidate_session_after_late
     let seen_provider_request = Arc::new(Mutex::new(None::<SeenProviderRequest>));
     let seen_provider_request_clone = Arc::clone(&seen_provider_request);
     let provider_app = Router::new().route(
-        "/v1/chat/completions",
+        "/chat/completions",
         any(move |request: Request| {
             let seen_provider_request_inner = Arc::clone(&seen_provider_request_clone);
             async move {

apps/aether-gateway/src/tests/ai_execute/sync/image.rs

@@ -486,7 +486,7 @@ async fn gateway_converts_gemini_image_sync_to_openai_image_provider_impl() {
         StoredProviderCatalogProvider::new(
             "provider-openai-image-bridge-1".to_string(),
             "openai".to_string(),
-            Some("https://api.openai.com".to_string()),
+            Some("https://api.openai.com/v1".to_string()),
             "openai".to_string(),
         )
         .expect("provider should build")
@@ -514,7 +514,7 @@ async fn gateway_converts_gemini_image_sync_to_openai_image_provider_impl() {
         )
         .expect("endpoint should build")
         .with_transport_fields(
-            "https://api.openai.com".to_string(),
+            "https://api.openai.com/v1".to_string(),
             None,
             None,
             Some(2),