[SPRINT-3] docs: Add page specifications and dead code analysis
## ST-3.3 Documentation (3 SP)
- Add 11 page specification files documenting 25 pages
- Create docs/05-frontend/pages/ directory
- Specs: Goals, MLM, Portfolio, RBAC, Notifications, Analytics,
Audit, Storage, Webhooks, Settings
- Add _INDEX.md with complete listing
## ST-3.4 Dead Code Analysis (1 SP)
- Analyze usePortfolio hook usage (18/21 functions used)
- Document components ready for future use
- Decision: Keep all code as preparation for features
- Create DEAD-CODE-REPORT.md
## Frontend Submodule
- WCAG improvements (11 files)
- 160 unit tests (8 new test files)
Sprint 3 (P2) completed: 14 SP
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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