feat: add zai provider support (#7626)

* feat: add zai provider support

* add zai_api_key secret to deploy-core

* add to justfile

* add testing, provider integration skill

* enable zai key

* fix zai test

* clean up skill a little

* small changes

letta/server/server.py

@@ -69,6 +69,7 @@ from letta.schemas.providers import (
     TogetherProvider,
     VLLMProvider,
     XAIProvider,
+    ZAIProvider,
 )
 from letta.schemas.sandbox_config import LocalSandboxConfig, SandboxConfigCreate
 from letta.schemas.secret import Secret
@@ -316,6 +317,14 @@ class SyncServer(object):
                     api_key_enc=Secret.from_plaintext(model_settings.xai_api_key),
                 )
             )
+        if model_settings.zai_api_key:
+            self._enabled_providers.append(
+                ZAIProvider(
+                    name="zai",
+                    api_key_enc=Secret.from_plaintext(model_settings.zai_api_key),
+                    base_url=model_settings.zai_base_url,
+                )
+            )
         if model_settings.openrouter_api_key:
             self._enabled_providers.append(
                 OpenRouterProvider(