feat: P1 full implementation - 8 modules + frontend pages + feishu WS
P1 Backend (8 modules, 50+ new API endpoints):
- P1-1: Stakeholder management (power-interest matrix)
- P1-2: WBS task decomposition (tree structure + AI split)
- P1-3: Risk management (register + matrix + AI identify)
- P1-4: Requirement pool (MoSCoW + coverage + conflict detect)
- P1-5: Change management (submit → evaluate → approve → implement)
- P1-6: Health report (6 dimensions + red/yellow/green)
- P1-7: Retrospective & knowledge base
- P1-8: Multi-model support (6 models + strategy selection)
Frontend (9 pages with sidebar navigation):
- Project wizard, Kanban, Stakeholders, WBS, Risks,
Requirements, Changes, Health, Retrospective
Feishu integration:
- WebSocket long-connection for receiving messages
- Card button callback with decision tracking
- 11 chat commands for P0+P1 features
Tech: TypeScript, React 18, Arco Design, Hono, @larksuiteoapi/node-sdk
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