Initial upload of BB-Apartment 2026 website.

Adds the complete Next.js website including i18n routing, house and
apartment pages, Beds24 v2 integration for live availability/pricing,
Stripe checkout, contact forms, Docker setup and deployment docs.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

.env.local.example

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+# Beds24 API (v2) — each house has its own separate Beds24 account/login,
+# so each needs its own invite code exchanged for its own refresh token:
+# 1. Log into that house's Beds24 account: Settings > Account > Apps/API >
+#    "Generate invite code" (scopes: inventory, later also "bookings")
+# 2. Exchange once: curl -H "code: <invite-code>" https://api.beds24.com/v2/authentication/setup
+# 3. Paste the returned "refreshToken" value below.
+BEDS24_REFRESH_TOKEN_HERDWEG=your_beds24_refresh_token_for_herdweg
+BEDS24_REFRESH_TOKEN_SCHOENAICHER=your_beds24_refresh_token_for_schoenaicher
+
+# Stripe (one account per house)
+NEXT_PUBLIC_BASE_URL=https://www.BB-Apartment.de
+STRIPE_ACCOUNT_HERDWEWEG=acct_xxxxxxxxxxxxxxxx
+STRIPE_ACCOUNT_SCHOENAICHER=acct_xxxxxxxxxxxxxxxx
+STRIPE_SECRET_KEY_HERDWEWEG=sk_test_xxxxxxxxxxxxxxxx
+STRIPE_SECRET_KEY_SCHOENAICHER=sk_test_xxxxxxxxxxxxxxxx
+STRIPE_WEBHOOK_SECRET_HERDWEWEG=whsec_xxxxxxxxxxxxxxxx
+STRIPE_WEBHOOK_SECRET_SCHOENAICHER=whsec_xxxxxxxxxxxxxxxx
+
+# Database (used by Next.js and n8n)
+DATABASE_URL=postgresql://bbapartment:changeme@postgres:5432/bb_apartment
+POSTGRES_USER=bbapartment
+POSTGRES_PASSWORD=changeme
+POSTGRES_DB=bb_apartment
+
+# n8n
+N8N_BASIC_AUTH_USER=admin
+N8N_BASIC_AUTH_PASSWORD=changeme
+N8N_WEBHOOK_URL=https://n8n.bb-apartment.de/
+
+# SMTP (own server) — used by the contact form (/api/contact) and, later,
+# booking confirmation emails. Without these set, contact messages are just
+# logged to the server console instead of sent (useful for local dev).
+SMTP_HOST=mail.your-server.de
+SMTP_PORT=587
+SMTP_USER=your_smtp_user
+SMTP_PASSWORD=your_smtp_password
+SMTP_FROM=noreply@bb-apartment.de
+# Inbox that receives contact form submissions (defaults to info@bb-apartment.de)
+CONTACT_INBOX_EMAIL=info@bb-apartment.de