feat: Add frontend UI prototypes for Phase 1 features
Interactive design prototypes for review:
- Project Dashboard (#36) - Status, agents, sprints, activity
- Agent Configuration (#37) - Agent type templates, MCP permissions
- Issue Management (#38) - Issue list with filtering, workflow actions
- Activity Feed (#39) - Real-time events with grouping and filtering
Each prototype demonstrates UI/UX concepts for approval before
production implementation. Accessible at /prototypes route.
Closes #36, #37, #38, #39
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>