Adds enable_monitoring variable (default true) that controls whether
Prometheus/Grafana, Loki, Fluent Bit, and Jaeger are deployed.
Setting it to false saves ~1.5 GB RAM, making the stack viable on
a 2–4 GB VPS without touching the application services.
Also caps MongoDB WiredTiger cache at 256 MB (--wiredTigerCacheSizeGB=0.25)
so it doesn't balloon on memory-constrained hosts.
Co-authored-by: Gonçalo Rodrigues <guga@Goncalos-MacBook-Pro.local>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
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