refactor: move installer to dedicated repo, wire as git submodule

The installer (install.sh, templates/, bootstrap scripts) now lives in
cameleer/cameleer-saas-installer (public repo). Added as a git submodule
at installer/ so compose templates remain the single source of truth.

Dev compose is now a thin overlay (ports + volume mount + dev env vars).
Production templates are chained via COMPOSE_FILE in .env:
  installer/templates/docker-compose.yml
  installer/templates/docker-compose.saas.yml
  docker-compose.yml (dev overrides)

No code duplication — fixes to compose templates go to the installer
repo and propagate to both production deployments and dev via submodule.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

installer/templates/.env.example

@@ -1,102 +0,0 @@
-# Cameleer Configuration
-# Copy this file to .env and fill in the values.
-# The installer generates .env automatically — this file is for reference.
-
-# ============================================================
-# Compose file assembly (set by installer)
-# ============================================================
-# SaaS:        docker-compose.yml:docker-compose.saas.yml
-# Standalone:  docker-compose.yml:docker-compose.server.yml
-# Add :docker-compose.tls.yml for custom TLS certificates
-# Add :docker-compose.monitoring.yml for external monitoring network
-COMPOSE_FILE=docker-compose.yml:docker-compose.saas.yml
-
-# ============================================================
-# Image version
-# ============================================================
-VERSION=latest
-
-# ============================================================
-# Public access
-# ============================================================
-PUBLIC_HOST=localhost
-PUBLIC_PROTOCOL=https
-# Auth domain (Logto). Defaults to PUBLIC_HOST for single-domain setups.
-# Set to a separate subdomain (e.g. auth.cameleer.io) to split auth from the app.
-# AUTH_HOST=localhost
-
-# ============================================================
-# Ports
-# ============================================================
-HTTP_PORT=80
-HTTPS_PORT=443
-# Set to 0.0.0.0 to expose Logto admin console externally (default: localhost only)
-# LOGTO_CONSOLE_BIND=0.0.0.0
-LOGTO_CONSOLE_PORT=3002
-
-# ============================================================
-# PostgreSQL
-# ============================================================
-POSTGRES_USER=cameleer
-POSTGRES_PASSWORD=CHANGE_ME
-# SaaS: cameleer_saas, Standalone: cameleer
-POSTGRES_DB=cameleer_saas
-
-# ============================================================
-# ClickHouse
-# ============================================================
-CLICKHOUSE_PASSWORD=CHANGE_ME
-
-# ============================================================
-# Admin credentials (SaaS mode)
-# ============================================================
-SAAS_ADMIN_USER=admin
-SAAS_ADMIN_PASS=CHANGE_ME
-
-# ============================================================
-# Admin credentials (standalone mode)
-# ============================================================
-# SERVER_ADMIN_USER=admin
-# SERVER_ADMIN_PASS=CHANGE_ME
-# BOOTSTRAP_TOKEN=CHANGE_ME
-
-# ============================================================
-# SMTP (for email verification during registration)
-# ============================================================
-# Required for self-service sign-up. Without SMTP, only admin-created users can sign in.
-SMTP_HOST=
-SMTP_PORT=587
-SMTP_USER=
-SMTP_PASS=
-SMTP_FROM_EMAIL=noreply@cameleer.io
-
-# ============================================================
-# TLS
-# ============================================================
-# Set to 1 to reject unauthorized TLS certificates (production)
-NODE_TLS_REJECT=0
-# Custom TLS certificate paths (inside container, set by installer)
-# CERT_FILE=/user-certs/cert.pem
-# KEY_FILE=/user-certs/key.pem
-# CA_FILE=/user-certs/ca.pem
-
-# ============================================================
-# Docker
-# ============================================================
-DOCKER_SOCKET=/var/run/docker.sock
-# GID of the docker socket — detected by installer, used for container group_add
-DOCKER_GID=0
-
-# ============================================================
-# Provisioning images (SaaS mode only)
-# ============================================================
-# CAMELEER_SAAS_PROVISIONING_SERVERIMAGE=gitea.siegeln.net/cameleer/cameleer-server:latest
-# CAMELEER_SAAS_PROVISIONING_SERVERUIIMAGE=gitea.siegeln.net/cameleer/cameleer-server-ui:latest
-# CAMELEER_SAAS_PROVISIONING_RUNTIMEBASEIMAGE=gitea.siegeln.net/cameleer/cameleer-runtime-base:latest
-
-# ============================================================
-# Monitoring (optional)
-# ============================================================
-# External Docker network name for Prometheus scraping.
-# Only needed when docker-compose.monitoring.yml is in COMPOSE_FILE.
-# MONITORING_NETWORK=prometheus