Add booking stack, client deploys, and back-office updates

- deploy/booking: shared Easy!Appointments stack with brand-matched
  wizard (flatpickr recolor, single-tenant provider hide, iframe
  auto-fit height reporter)
- deploy/clients: per-client isolated nginx compose stacks with
  _template scaffold, new-client.sh, and happynails live site
- deploy/backup: smb-db backup script
- n8n: booking-sync workflow; onboarding tweaks
- playbooks: lead-to-customer lifecycle + outreach
- templates: nail-studio landing previews
- backoffice: app/db/init/compose updates

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

deploy/booking/docker-compose.yml

@@ -0,0 +1,70 @@
+# booking/ — self-hosted appointment scheduler (Easy!Appointments) + its DB.
+#
+# One shared instance serves all clients; each client = a provider/service with
+# its own booking-page URL. Lightweight (PHP + MariaDB) to fit the 16 GB box.
+# Booking events fire a webhook -> n8n "booking-sync" -> CRM `bookings` + notify.
+# Routed by Caddy: booking.mivanchenko.de { reverse_proxy easyappointments:80 }
+name: smb-booking
+
+services:
+  ea-db:
+    image: mariadb:11
+    container_name: ea-db
+    restart: unless-stopped
+    environment:
+      MARIADB_DATABASE: easyappointments
+      MARIADB_USER: ea
+      MARIADB_PASSWORD: ${EA_DB_PASSWORD}
+      MARIADB_ROOT_PASSWORD: ${EA_DB_ROOT_PASSWORD}
+    volumes:
+      - ea-db-data:/var/lib/mysql
+    networks: [booking-net]
+    mem_limit: 512m
+    healthcheck:
+      test: ["CMD", "healthcheck.sh", "--connect", "--innodb_initialized"]
+      interval: 10s
+      timeout: 5s
+      retries: 6
+
+  easyappointments:
+    image: alextselegidis/easyappointments:latest
+    container_name: easyappointments
+    restart: unless-stopped
+    environment:
+      BASE_URL: https://booking.mivanchenko.de
+      DEBUG_MODE: "FALSE"
+      DB_HOST: ea-db
+      DB_NAME: easyappointments
+      DB_USERNAME: ea
+      DB_PASSWORD: ${EA_DB_PASSWORD}
+      # Email is optional — booking notifications go via webhook -> n8n. Fill to
+      # also send customers EA's own confirmation emails.
+      MAIL_PROTOCOL: mail
+      MAIL_FROM_ADDRESS: info@booking.mivanchenko.de
+      MAIL_FROM_NAME: Buchung
+    volumes:
+      # Brand-matched booking wizard: recolours the flatpickr datepicker to the
+      # client's --bs-primary and compacts the layout so the embed fits its
+      # iframe without an outer scrollbar. (Wizard chrome colour itself comes
+      # from the EA "company colour" setting.) Re-sync from upstream on EA upgrade.
+      # NOTE: production (DEBUG_MODE=FALSE) serves the .min.* bundles, so those
+      # are the ones that must be overridden — the plain files are dev-only.
+      - ./frontend.css:/var/www/html/assets/css/frontend.css:ro
+      - ./frontend.css:/var/www/html/assets/css/frontend.min.css:ro
+      # Reports the wizard's rendered height to the embedding page so the iframe
+      # auto-fits to its content (no inner scrollbar). Re-sync on EA upgrade.
+      - ./booking_layout.js:/var/www/html/assets/js/layouts/booking_layout.js:ro
+      - ./booking_layout.js:/var/www/html/assets/js/layouts/booking_layout.min.js:ro
+    depends_on:
+      ea-db:
+        condition: service_healthy
+    networks: [booking-net, proxy]   # proxy: reached by Caddy as easyappointments:80
+    mem_limit: 256m
+
+volumes:
+  ea-db-data:
+
+networks:
+  booking-net:
+  proxy:
+    external: true