feat(provider): add LongCat via OpenAI-compatible backend

tests/providers/test_longcat_provider.py

@@ -0,0 +1,29 @@
+"""Tests for the LongCat provider registration."""
+
+from nanobot.config.schema import ProvidersConfig
+from nanobot.providers.registry import PROVIDERS, find_by_name
+
+
+def test_longcat_config_field_exists():
+    """ProvidersConfig should have a longcat field."""
+    config = ProvidersConfig()
+    assert hasattr(config, "longcat")
+
+
+def test_longcat_provider_in_registry():
+    """LongCat should be registered in the provider registry."""
+    specs = {s.name: s for s in PROVIDERS}
+    assert "longcat" in specs
+
+    longcat = specs["longcat"]
+    assert longcat.backend == "openai_compat"
+    assert longcat.env_key == "LONGCAT_API_KEY"
+    assert longcat.default_api_base == "https://api.longcat.chat/openai"
+
+
+def test_find_by_name_longcat():
+    """find_by_name should resolve the LongCat provider."""
+    spec = find_by_name("longcat")
+
+    assert spec is not None
+    assert spec.name == "longcat"