FG-180 Support Z.ai chat completion API (#33)

Author: lingtonglu

app/services/providers/adapter_factory.py

@@ -15,6 +15,7 @@
 from .vertex_adapter import VertexAdapter
 from .gemini_openai_adapter import GeminiOpenAIAdapter
 from .alibaba_adapter import AlibabaAdapter
+from .zai_adapter import ZAIAdapter
 
 
 class ProviderAdapterFactory:
@@ -181,6 +182,10 @@ class ProviderAdapterFactory:
             "base_url": "https://open.bigmodel.cn/api/paas/v4",
             "adapter": ZhipuAdapter,
         },
+        "z.ai": {
+            "base_url": "https://api.z.ai/api/paas/v4",
+            "adapter": ZAIAdapter,
+        },
         "azure": {
             "adapter": AzureAdapter,
         },

app/services/providers/zai_adapter.py

@@ -0,0 +1,18 @@
+from .openai_adapter import OpenAIAdapter
+
+# https://docs.z.ai/api-reference/llm/chat-completion#body-model
+ZAI_MODELS = [
+    "glm-4.5",
+    "glm-4.5-air",
+    "glm-4.5-x",
+    "glm-4.5-airx",
+    "glm-4.5-flash",
+    "glm-4-32b-0414-128k",
+]
+
+
+class ZAIAdapter(OpenAIAdapter):
+    """Adapter for Zai API"""
+
+    async def list_models(self, api_key: str) -> list[str]:
+        return ZAI_MODELS