harden nginx security and document Cloudflare setup in Phase A#32
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nginx: add malicious bot/scanner user-agent blocking, real IP resolution via CF-Connecting-IP to fix broken per-client rate limiting behind ALB, strip conflicting Spring Security 6 headers with proxy_hide_header, add short URL enumeration protection on redirect endpoint, and connection limits with slow-read timeouts. docs: integrate Cloudflare free plan setup as Step 12 in Phase A — covers DNS record migration, nameserver switch at Namecheap, SSL mode, rate limit rule, and rollback procedure.
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nginx: add malicious bot/scanner user-agent blocking, real IP resolution via CF-Connecting-IP to fix broken per-client rate limiting behind ALB, strip conflicting Spring Security 6 headers with proxy_hide_header, add short URL enumeration protection on redirect endpoint, and connection limits with slow-read timeouts.
docs: integrate Cloudflare free plan setup as Step 12 in Phase A — covers DNS record migration, nameserver switch at Namecheap, SSL mode, rate limit rule, and rollback procedure.