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.md

@@ -0,0 +1,17 @@
+# Halo Bestie — Requirements
+
+This folder contains requirement documents for all project phases.
+
+> See root `CLAUDE.md` for full project context and architectural decisions.
+
+## Purpose
+
+- Document feature requirements per phase
+- Define acceptance criteria
+- Capture domain rules and business logic decisions
+
+## Conventions
+
+- Name documents clearly by phase and domain (e.g. `phase1-auth.md`, `phase1-payment.md`)
+- Each document should reference which app(s) it affects: `client_app`, `mitra_app`, `control_center`, `backend`
+- Real-time / chat features are planned for a future phase