Feat/rpc caddy ratelimit hardening#105
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Set up the public RPC origin to run behind the Cloudflare proxy with defense-in-depth, and document the full flow. - Caddy.Dockerfile: build Caddy with the caddy-ratelimit plugin - docker-compose.rpc.yml: build the custom Caddy image; cap the node with mem_limit/cpus (RPC_MEM_LIMIT default 6g, RPC_CPUS default 1.5, sized for a 2 vCPU / 8 GB VPS) so a query flood can't starve the host - Caddyfile: terminate TLS with a Cloudflare Origin Certificate (Let's Encrypt disabled — incompatible with the CF proxy) and rate-limit per client IP (100 req / 10s, keyed on CF-Connecting-IP) - .env.rpc.example: document RPC_MEM_LIMIT / RPC_CPUS; correct the RPC_DOMAIN note for the origin-cert + proxied setup - scripts/sync-cloudflare-ufw.sh: idempotent, fail-closed cron script to keep the ufw 80/443 allow-list in sync with Cloudflare's edge ranges (v4 + v6) - rpc-node.md: rewrite for the Cloudflare model — Cloudflare-only firewall, origin certificate (with rationale vs Let's Encrypt), custom Caddy build, rate limit, and the IP-sync cron
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