Production deployment setup + feature complete

- Dockerfile + deploy.sh for Hetzner server
- Email verification via Better Auth + Resend
- Invite code flow (6-digit OTP, generate/join)
- Settlement share percent fix (payer vs debtor)
- OCR scanner fixes (date display, retry, viewfinder)
- app.json icon/splash/adaptive-icon configured
- iOS deployment target 15.5 (ML Kit requirement)
- DB migration 0014: household_invitations table

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/native/app/(auth)/_layout.tsx

@@ -0,0 +1,14 @@
+import { Stack } from "expo-router";
+
+export default function AuthLayout() {
+  return (
+    <Stack screenOptions={{ headerShown: false }}>
+      <Stack.Screen name="login" />
+      <Stack.Screen name="register" />
+      <Stack.Screen name="onboarding" />
+      <Stack.Screen name="setup" />
+      <Stack.Screen name="forgot-password" />
+      <Stack.Screen name="reset-password" />
+    </Stack>
+  );
+}