docs: fix Next.js 14→15 version refs, add libs to CLAUDE.md

- Update stale Next.js 14 references to 15 in audit docs
- Add libs/ai-services and libs/mcp-servers to CLAUDE.md project structure

Resolves TEC-2259

Co-Authored-By: Paperclip <noreply@paperclip.ing>

docs/audits/FRONTEND_EXPLORATION.md

@@ -1,9 +1,9 @@
 # GoodGo Platform Frontend Exploration Report
-## apps/web (Next.js 14 with App Router)
+## apps/web (Next.js 15 with App Router)
 
 **Date:** April 9, 2026  
 **Status:** Pre-i18n (No existing i18n setup detected)  
-**Next.js Version:** 14.2.0 | **React:** 18.3.0  
+**Next.js Version:** 15.5.14 | **React:** 18.3.0  
 **Primary Language:** Vietnamese (vi_VN)
 
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