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>

packages/env/src/server.ts

@@ -9,6 +9,16 @@ export const env = createEnv({
     BETTER_AUTH_URL: z.url(),
     CORS_ORIGIN: z.url(),
     NODE_ENV: z.enum(["development", "production", "test"]).default("development"),
+    APPLE_CLIENT_ID: z.string().optional(),
+    APPLE_TEAM_ID: z.string().optional(),
+    APPLE_KEY_ID: z.string().optional(),
+    APPLE_PRIVATE_KEY: z.string().optional(),
+    MOBILE_APP_SCHEME: z.string().default("haushaltsApp://"),
+    SMTP_HOST: z.string().default("localhost"),
+    SMTP_PORT: z.coerce.number().default(1025),
+    SMTP_USER: z.string().optional(),
+    SMTP_PASSWORD: z.string().optional(),
+    SMTP_FROM: z.string().default("noreply@haushaltsapp.local"),
   },
   runtimeEnv: process.env,
   emptyStringAsUndefined: true,