docs(api-server): update architectural deep dive guide link

Updated the link to the Architectural Deep Dive: Data Access Flow guide to ensure it is correctly referenced within the middleware documentation.

Author: fulleni

src/content/docs/api-server/architecture/middleware.mdx

@@ -34,5 +34,5 @@ The server defines middleware at different levels of the route tree. Here’s a
     -   `ownershipCheckMiddleware`: Verifies if the authenticated user is the owner of the fetched item, if required by the `ModelConfig`.
 
 <Aside type="note">
-For a complete, step-by-step walkthrough of how these middleware interact with the data registries, see the [**Architectural Deep Dive: Data Access Flow**](./data-access-flow) guide.
+For a complete, step-by-step walkthrough of how these middleware interact with the data registries, see the [**Architectural Deep Dive: Data Access Flow**](/docs/api-server/architecture/data-access-flow) guide.
 </Aside>