feat: initial installer release

Installer scripts and compose templates for deploying the Cameleer
SaaS platform. Supports multi-tenant SaaS and standalone modes.

Bootstrap:
  curl -fsSL https://registry.cameleer.io/.../get-cameleer.sh | bash

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

templates/docker-compose.monitoring.yml

@@ -0,0 +1,7 @@
+# External monitoring network overlay
+# Overrides the noop monitoring bridge with a real external network
+
+networks:
+  monitoring:
+    external: true
+    name: ${MONITORING_NETWORK:?MONITORING_NETWORK must be set in .env}