docs: audit reports + feature docs + skills + admin-v2 + config sync

Update audit tracker, roadmap, architecture docs,
add admin-v2 Roles page + Billing tests,
sync CLAUDE.md, Cargo.toml, docker-compose.yml,
add deep-research / frontend-design / chart-visualization skills

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/features/02-intelligence-layer/06-context-compaction.md

@@ -1,7 +1,7 @@
 # 上下文压缩系统 (Context Compaction)
 
-> **成熟度**: L3 - 成熟 (内核 AgentLoop 已集成，前端重复压缩已移除)
-> **最后更新**: 2026-03-27
+> **成熟度**: L4 - 生产 (内核 AgentLoop 已集成，前端重复压缩已移除)
+> **最后更新**: 2026-04-01
 > **负责人**: Intelligence Layer Team
 
 ## 概述