feat(broadcasts,surveys): Phase 1 complete - backend modules
- broadcasts/types.ts: Broadcast, BroadcastTarget, BroadcastMetrics, InAppMessage
- broadcasts/repository.ts: CRUD + delivery tracking + read receipts
- broadcasts/targeting.ts: evaluateTarget(), semver, FNV-1a hash
- broadcasts/routes.ts: Admin CRUD + public endpoints (14 routes)
- surveys/types.ts: Survey, Question, SurveyResponse, conditional logic
- surveys/repository.ts: CRUD + analytics + CSV export
- surveys/routes.ts: Admin CRUD + public endpoints (13 routes)
- cosmos-init.ts: 7 new containers with TTL policies
- server.ts: Register broadcastRoutes + surveyRoutes
Implements Phase 1 of platform_BROADCAST_SURVEY_ROADMAP.md
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