fix(docs): SEO improvements for page titles, internal links, and URL structure (#7224)

docs/open-source/features/overview.mdx

@@ -1,5 +1,7 @@
 ---
 title: "Overview"
+seo:
+  title: "Open Source Features Overview - Mem0"
 description: "Self-hosting features that extend Mem0 beyond basic memory storage"
 icon: "list"
 ---
@@ -36,7 +38,7 @@ Mem0 Open Source ships with capabilities that adapt memory behavior for producti
   <Card title="REST API" icon="code" href="/open-source/features/rest-api">
     HTTP endpoints for language-agnostic integrations.
   </Card>
-  <Card title="OpenAI Compatibility" icon="message-bot" href="/open-source/features/openai_compatibility">
+  <Card title="OpenAI Compatibility" icon="message-bot" href="/open-source/features/openai-compatibility">
     Drop-in replacement for OpenAI chat endpoints.
   </Card>
 </CardGroup>