docs(ai-gateway): mark AI Gateway as a preview feature

docs/guides/ai-gateway.md

@@ -1,8 +1,9 @@
 ---
 doc_type: guide
+preview: true
 ---
 
-# AI Gateway
+# AI Gateway <PreviewTag />
 
 AI Gateway provides a unified, OpenAI-compatible endpoint for accessing a range of large language models through a single API. The platform manages all model credentials, so you don't need to bring your own API keys. Every request is authenticated against your workspace's auth, and each gateway is isolated to its own workspace-scoped endpoint.
 

docs/reference/platform/service-lifecycle-policy.md

@@ -50,6 +50,7 @@ The following table shows the current lifecycle stage for Tailor Platform servic
 
 | Service/Feature                                                | Stage                               | Notes                                                      |
 | -------------------------------------------------------------- | ----------------------------------- | ---------------------------------------------------------- |
+| **[AI Gateway](/guides/ai-gateway)**                           | <Tag color="emerald">Preview</Tag>  | Unified OpenAI-compatible endpoint for accessing LLMs      |
 | **[Built-in IdP](/guides/auth/integration/built-in-idp)**      | <Tag color="emerald">Preview</Tag>  | Identity provider functionality for authentication         |
 | **tailorctl manifest**                                         | <Tag color="zinc">Maintenance</Tag> | CUE-based manifest configuration for tailorctl             |
 | **TailorDB Draft**                                             | <Tag color="amber">Deprecated</Tag> | Draft record functionality - use separate tables instead   |