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>

control_center/.env.example

@@ -0,0 +1,7 @@
+# Internal API base URL — accessible via VPN only
+VITE_API_BASE_URL=https://internal.halobestie.com
+
+# Firebase
+VITE_FIREBASE_API_KEY=
+VITE_FIREBASE_AUTH_DOMAIN=
+VITE_FIREBASE_PROJECT_ID=