Add conversation/contact/history/escalation-log endpoints, contact-scoped
whitelist matching, bearer sessions, ADMIN_API_TOKEN guards, and
`go run . migrate`. Update Flutter client to persist/send session tokens
and mark A1/A2 complete in the prioritized checklist.
Co-authored-by: okuma <o0kuma@users.noreply.github.com>
Scaffold `mobile/` against core-backend APIs (signup, chat, draft,
veto, retract, autonomy/whitelist). Update roadmap/README/AGENTS so
participant PoC #1/#3 stays the final Phase 1 step after app build.
Co-authored-by: okuma <o0kuma@users.noreply.github.com>