Phase 1 scaffold: auth for all apps

- Backend: Fastify with two listeners (public + internal), routes, services, DB migration + seed
- client_app: Flutter with BLoC, all auth screens (welcome, display name, register, OTP, force-register)
- mitra_app: Flutter with BLoC, OTP-only login
- control_center: React + Vite, email/password login, mitra/user management, anonymity settings
- Docs: phase1 plan, API contract, client app mockup
- CLAUDE.md and shared memory for all subprojects

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

requirement/.claude/memory/MEMORY.md

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+# Memory Index
+
+- [Requirement Context](context.md) — Phased docs, naming conventions, real-time/chat deferred to future phase

requirement/.claude/memory/context.md

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+---
+name: Requirement Context
+description: Conventions and scope for Halo Bestie requirement documents
+type: project
+---
+
+Phased requirement documents for all apps.
+
+**Naming convention:** `phase<N>-<domain>.md` (e.g. `phase1-auth.md`, `phase1-payment.md`)
+
+**Each doc must state:** which app(s) it affects (`client_app`, `mitra_app`, `control_center`, `backend`) and any backend route implications.
+
+**Known deferred:** Real-time chat and live features are out of scope for initial phases — planned for a future phase.