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>

client_app/lib/features/home/home_screen.dart

@@ -0,0 +1,39 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+import '../../core/auth/auth_bloc.dart';
+
+/// Phase 1 placeholder — will be replaced in Phase 2 with chat/session features.
+class HomeScreen extends StatelessWidget {
+  const HomeScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return BlocBuilder<AuthBloc, AuthState>(
+      builder: (context, state) {
+        final displayName = state is AuthAuthenticated
+            ? state.profile['display_name'] as String
+            : state is AuthAnonymous
+                ? state.displayName
+                : '';
+
+        return Scaffold(
+          appBar: AppBar(
+            title: const Text('Halo Bestie'),
+            actions: [
+              IconButton(
+                icon: const Icon(Icons.logout),
+                onPressed: () => context.read<AuthBloc>().add(LogoutRequested()),
+              ),
+            ],
+          ),
+          body: Center(
+            child: Text(
+              'Halo, $displayName!',
+              style: const TextStyle(fontSize: 24),
+            ),
+          ),
+        );
+      },
+    );
+  }
+}