Release v1.8.1

- 21 code review fixes (CRITICAL security issues, CORS, auth middleware, input validation)
- internal/ package encapsulation (backup, project, skill, tag, translations, worktree)
- board.go decomposed into 4 focused files
- 38 new tests (update, skill loader, skill registry)
- Removed unused schemas/ and skills-catalog.yaml
- Webchat: terminal auto-skip-permissions made opt-in

v1.8.0: Webchat CLI + revfactory-harness skill + CLAUDE.md optimization

fix: [1.7.7] webchat session restore + IME input + Monaco CSP + new c…

…hat response

chore: [1.7.6] remove incomplete site-flow feature

feat: [1.7.5] webchat UI consistency + session routing + docs update

security: path traversal + shell injection + WSS maxPayload + Error B…

…oundary

fix: [1.7.3] security headers + input validation + chat perf improvem…

…ents

fix: [1.7.2] security hardening + performance optimizations

feat: [1.7.1] Next.js App Router migration + team tab project path di…

…splay

feat: [1.7.0] multi-agent team orchestration + webchat Issues log format