Deployment Redesign

Implemented the deployment redesign.
- Added Dockge-first-class stacks:
  - [stacks/infra/compose.yaml]
  - [stacks/caddy/compose.yaml]
- Added reusable business template: [deploy/business-compose.yaml.template]
- Added automated provisioning: [scripts/create-business.sh]
- Added per-business database/user, secrets, media volume, private networks, and Caddy route generation.
- Removed Traefik and manual business Compose files.
- Updated environment templates, .gitignore, and deployment documentation in [README.md]
Validation completed:
- Docker Compose config passed for infra, Caddy, and generated business stacks.
- Shell syntax validation passed.
- Registry image tags containing / were tested.
- No remaining Traefik or obsolete deployment references found.

.env.infra.example

@@ -1,20 +1,5 @@
-# Shared infrastructure config — see docker-compose.infra.yaml for the
-# full setup sequence. Copy this to `.env.infra` (kept out of git — see
-# .gitignore) and fill in real values.
-#
-#   docker network create next-chair-edge
-#   docker compose -f docker-compose.infra.yaml --env-file .env.infra up -d
-
-# ── MySQL (shared server — one database per business, created manually
-# per business, see docker-compose.infra.yaml's own header) ────────────
-MYSQL_ROOT_PASSWORD="replace-me"
-# Host-machine port MySQL is reachable on, e.g. for a GUI client over an
-# SSH tunnel — every business's app container always reaches it via the
-# shared Docker network and the service name `next-chair-mysql`, never
-# this.
-MYSQL_HOST_PORT=3306
-
-# ── Traefik (reverse proxy + automatic TLS via Let's Encrypt) ──────────
-# Let's Encrypt sends renewal/expiry notices here — use a real address
-# you actually check, not a placeholder.
-ACME_EMAIL="you@example.com"
+# Shared infrastructure config. Copy to `.env.infra`; the real file is
+# ignored by git and is also read by scripts/create-business.sh.
+MYSQL_ROOT_PASSWORD="replace-with-a-long-random-password"
+# Optional loopback-only port for an SSH tunnel or local admin tool.
+MYSQL_HOST_PORT=127.0.0.1:3306