fix(models): query v1 models for llama-server endpoints (#3380)

* fix(models): query v1 models for llama-server endpoints

* test(models): accept owner kwargs in llama-server regression

tests/test_llama_server_models_url.py

@@ -0,0 +1,58 @@
+"""Regression coverage for llama-server style /v1 model-list endpoints (#3330)."""
+
+import httpx
+
+from src import endpoint_resolver, llm_core, model_context
+
+
+def test_build_models_url_accepts_v1_base_and_chat_url(monkeypatch):
+    monkeypatch.setattr(endpoint_resolver, "resolve_url", lambda url: url)
+
+    assert (
+        endpoint_resolver.build_models_url("http://127.0.0.1:8080/v1")
+        == "http://127.0.0.1:8080/v1/models"
+    )
+    assert (
+        endpoint_resolver.build_models_url("http://127.0.0.1:8080/v1/chat/completions")
+        == "http://127.0.0.1:8080/v1/models"
+    )
+
+
+def test_llm_core_list_model_ids_queries_models_for_v1_base(monkeypatch):
+    monkeypatch.setattr(endpoint_resolver, "resolve_url", lambda url: url)
+    monkeypatch.setattr(llm_core, "_configured_cached_model_ids", lambda url, **kwargs: [])
+    seen = []
+
+    def fake_get(url, headers=None, timeout=None):
+        seen.append(url)
+        request = httpx.Request("GET", url)
+        return httpx.Response(200, json={"data": [{"id": "qwen3"}]}, request=request)
+
+    monkeypatch.setattr(llm_core.httpx, "get", fake_get)
+
+    assert llm_core.list_model_ids("http://127.0.0.1:8080/v1", timeout=1) == ["qwen3"]
+    assert seen == ["http://127.0.0.1:8080/v1/models"]
+
+
+def test_model_context_queries_models_for_v1_base(monkeypatch):
+    monkeypatch.setattr(endpoint_resolver, "resolve_url", lambda url: url)
+    seen = []
+
+    def fake_get(url, timeout=None):
+        seen.append(url)
+        request = httpx.Request("GET", url)
+        if url.endswith("/slots"):
+            return httpx.Response(404, request=request)
+        return httpx.Response(
+            200,
+            json={"data": [{"id": "qwen3", "context_length": 32768}]},
+            request=request,
+        )
+
+    monkeypatch.setattr(model_context.httpx, "get", fake_get)
+
+    assert model_context._query_context_length("http://127.0.0.1:8080/v1", "qwen3") == 32768
+    assert seen == [
+        "http://127.0.0.1:8080/slots",
+        "http://127.0.0.1:8080/v1/models",
+    ]