docs: complete features docs sync — roadmap, TRUTH, security-auth

- roadmap.md: Tauri 177, skills 75, Pipeline 17 templates, Admin 15 pages
- TRUTH.md: Admin V2 15 pages, desktop settings 19 tabs, changelog entry
- 02-state-management.md: expanded Store details and descriptions
- 03-security-auth.md: updated date
- README.md: DeerFlow 2.0 description, skill count correction

docs/features/00-architecture/03-security-auth.md

@@ -3,7 +3,7 @@
 > **分类**: 架构层
 > **优先级**: P0 - 决定性
 > **成熟度**: L4 - 生产
-> **最后更新**: 2026-04-01
+> **最后更新**: 2026-04-06
 
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