feat(03-01): Phase 3 schema foundation — Reaction/Comment/Repost/Hashtag models + router stubs RED
- Prisma: add Reaction, Comment, Repost, Hashtag, PostHashtag models; PostType.REPOST enum
- Back-relations on Post and Pet for all Phase 3 models (named to avoid ambiguous-relation errors)
- 5 tRPC router stubs: reactions, comments, reposts, explore, search — all registered in _app.ts
- Extend prisma-mock.ts with Phase 3 model mocks
- 5 test scaffold files: 14 failing RED + 3 FORBIDDEN passing; 53 Phase 2 tests untouched
- Phase 3 planning: CONTEXT, RESEARCH, UI-SPEC, VALIDATION, 6 PLANs, ROADMAP + STATE updated
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
adminandClaude Sonnet 4.6
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