feat: add ACME account management with validation pipeline
- Register, view, and deactivate ACME accounts via API and UI - 16-check validation framework for certificate issuance readiness - DNS resolution, port, nginx, and firewall pre-flight checks - External IP detection with NAT support and fallback providers - Account card and settings modal in certificates page - Guard certificate issuance behind account registration - Update modal CSS to overlay-based approach - 1000+ lines of tests for validation and account handlers
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