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>

package.json

@@ -25,6 +25,8 @@
     "dev": "turbo dev",
     "build": "turbo build",
     "check-types": "turbo check-types",
+    "test:api": "cd apps/server && bun test ./src/__tests__",
+    "test:mobile": "bun test apps/native/src/__tests__",
     "dev:native": "turbo -F native dev",
     "dev:web": "turbo -F web dev",
     "dev:server": "turbo -F server dev",