docs(architecture): v2.0 complete architecture design documents
Add full architecture documentation suite for v2.0 redesign:
- 架构选型审阅版: Yudao Cloud + Vue3 + Vant tech stack decision
- 业务能力全景与模块归属: 12 modules, 299 capabilities
- 系统概要设计-技术决策版: full system design with SDK, tool chain, engineering governance
- 系统概要设计-投资人版: capital efficiency narrative and competitive moat
- 系统概要设计-开发团队版: developer handbook
- 模块架构与MVP覆盖度: directory structure and PRD coverage
- 竞品分析报告: 8 competitors deep analysis
Key decisions: Dify+OpenGame(AI), LayaAir CLI(export), ComfyUI(assets),
lightweight runtime <15KB(game feed).
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