refactor(platform-service): migrate product-specific modules to product repo backends
Remove 23 product-specific module directories from platform-service:
- ChronoMind: timers, routines, households, shared-timers, webhooks
- JarvisJr: jarvis-agents, jarvis-sessions, jarvis-memory, jarvis-teams, marketplace
- NomGap: fasting-sessions, fasting-protocols, body-stages, social-fasting, meal-log, push-triggers
- PeakPulse: peak-sessions, peak-routes
- MindLyst: brains, memory, reflections, daily-briefs, streaks
Update server.ts: remove product module imports and registrations
Update cosmos-init.ts: remove product-specific container definitions
Clean up server.test.ts: remove 5 stale vi.mock() calls
Update AGENTS.md: add section 13 (product backends), update test counts
Platform-service tests: 759 passing (platform-common only)
Product backends: PeakPulse 32, ChronoMind 171, JarvisJr 198, NomGap 152, MindLyst 59
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