docs: tighten FAQ model answer and fix SEO metadata

- Rewrite the "What model does Codebuff use?" answer to only
  list modes that actually ship (Default, Max, Lite) and the
  models actually in use (Opus 4.7, GPT-5.4, Gemini 3.1 Flash
  Lite), dropping stale mentions of Free mode and Relace for
  file rewrites (file writes are handled deterministically by
  the runtime).
- Update the mirrored FAQ entry in the docs page SEO structured
  data so it matches faq.mdx.

Made-with: Cursor

Author: bogdan0083

web/src/app/docs/[category]/[slug]/page.tsx

@@ -33,7 +33,7 @@ const FAQ_ITEMS = [
   {
     question: 'What model does Codebuff use?',
     answer:
-      'Multiple. The orchestrator uses Claude Opus 4.6 in Default and Max modes, or GLM 5.1 in Free mode. Subagents are matched to their tasks: Claude Opus 4.6 for code editing, GPT-5.1 for deep reasoning, Grok 4.1 Fast for terminal commands and research, and Relace AI for fast file rewrites.',
+      'Multiple. The orchestrator uses Claude Opus 4.7 in Default and Max modes, or GLM 5.1 in Lite mode. Subagents are matched to their tasks: Claude Opus 4.7 and GPT-5.4 for deep reasoning and code review, and Gemini 3.1 Flash Lite for terminal commands, file discovery, and web/docs research.',
   },
   {
     question: 'Can I use my Claude Pro or Max subscription with Codebuff?',

web/src/content/help/faq.mdx

@@ -13,7 +13,7 @@ Software development: Writing features, tests, and scripts across common languag
 
 ## What model does Codebuff use?
 
-Multiple. The orchestrator uses Claude Opus 4.7 in Default and Max modes, or GLM 5.1 in Free mode. Subagents are matched to their tasks: Claude Opus 4.7 (with GLM 5.1 as a lighter option) for code editing, Claude Opus 4.7 and GPT-5.4 for deep reasoning and code review, and Gemini 3.1 Flash Lite for terminal commands, file discovery, and web/docs research. Free mode includes code review support. See [What models do you use?](/docs/advanced/what-models) for the full breakdown.
+Multiple. The orchestrator uses Claude Opus 4.7 in Default and Max modes, or GLM 5.1 in Lite mode. Subagents are matched to their tasks: Claude Opus 4.7 and GPT-5.4 for deep reasoning and code review, and Gemini 3.1 Flash Lite for terminal commands, file discovery, and web/docs research. See [What models do you use?](/docs/advanced/what-models) for the full breakdown.
 
 ## Can I use my Claude Pro or Max subscription with Codebuff?