feat(providers): add app.nz openai-compatible provider

Register app_nz in openai_like providers.json with base_url https://app.nz/v1 and APP_NZ_API_KEY, plus resolution/config tests.

litellm/llms/openai_like/providers.json

@@ -176,5 +176,11 @@
       "max_completion_tokens": "max_tokens"
     },
     "supported_endpoints": ["/v1/chat/completions", "/v1/responses", "/v1/embeddings"]
+  },
+  "app_nz": {
+    "base_url": "https://app.nz/v1",
+    "api_key_env": "APP_NZ_API_KEY",
+    "api_base_env": "APP_NZ_API_BASE",
+    "base_class": "openai_gpt"
   }
 }

tests/test_litellm/llms/openai_like/test_appnz_provider.py

@@ -0,0 +1,84 @@
+"""
+Tests for app.nz provider configuration and resolution.
+"""
+
+import litellm
+
+
+class TestAppNZProviderConfig:
+    """Test app.nz JSON-configured provider"""
+
+    def test_appnz_json_config_exists(self):
+        """app_nz is registered in providers.json with the expected shape"""
+        from litellm.llms.openai_like.json_loader import JSONProviderRegistry
+
+        assert JSONProviderRegistry.exists("app_nz")
+
+        app_nz = JSONProviderRegistry.get("app_nz")
+        assert app_nz is not None
+        assert app_nz.base_url == "https://app.nz/v1"
+        assert app_nz.api_key_env == "APP_NZ_API_KEY"
+        assert app_nz.api_base_env == "APP_NZ_API_BASE"
+        assert app_nz.base_class == "openai_gpt"
+
+    def test_appnz_provider_resolution(self):
+        """Resolving an app_nz/* model returns the default app.nz base URL"""
+        from litellm.litellm_core_utils.get_llm_provider_logic import get_llm_provider
+
+        model, provider, api_key, api_base = get_llm_provider(
+            model="app_nz/app/auto",
+            custom_llm_provider=None,
+            api_base=None,
+            api_key=None,
+        )
+
+        assert model == "app/auto"
+        assert provider == "app_nz"
+        assert api_base == "https://app.nz/v1"
+
+    def test_appnz_api_base_override(self):
+        """An explicit api_base / api_key overrides the app.nz defaults"""
+        from litellm.litellm_core_utils.get_llm_provider_logic import get_llm_provider
+
+        model, provider, api_key, api_base = get_llm_provider(
+            model="app_nz/app/auto-code",
+            custom_llm_provider=None,
+            api_base="https://custom.example.com/v1",
+            api_key="app_live_test",
+        )
+
+        assert provider == "app_nz"
+        assert api_base == "https://custom.example.com/v1"
+        assert api_key == "app_live_test"
+
+    def test_appnz_dynamic_config(self):
+        """The generated dynamic config resolves to the app.nz base URL"""
+        from litellm.llms.openai_like.dynamic_config import create_config_class
+        from litellm.llms.openai_like.json_loader import JSONProviderRegistry
+
+        provider = JSONProviderRegistry.get("app_nz")
+        config_class = create_config_class(provider)
+        config = config_class()
+
+        api_base, _ = config._get_openai_compatible_provider_info(None, None)
+        assert api_base == "https://app.nz/v1"
+
+    def test_appnz_complete_url_appends_endpoint(self):
+        """get_complete_url appends the chat completions path to the app.nz base"""
+        from litellm.llms.openai_like.dynamic_config import create_config_class
+        from litellm.llms.openai_like.json_loader import JSONProviderRegistry
+
+        provider = JSONProviderRegistry.get("app_nz")
+        config_class = create_config_class(provider)
+        config = config_class()
+
+        url = config.get_complete_url(
+            api_base="https://app.nz/v1",
+            api_key="app_live_test",
+            model="app_nz/app/auto",
+            optional_params={},
+            litellm_params={},
+            stream=False,
+        )
+
+        assert url == "https://app.nz/v1/chat/completions"