Initial router DynDNS service

.env.example

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+DDNS_ADMIN_PASSWORD=change-me-long-random-admin-password
+DDNS_SESSION_SECRET=change-me-long-random-session-secret
+DDNS_PUBLIC_BASE_URL=https://ddns.example.net
+DDNS_HOSTNAME_SUFFIX=ddns.example.net
+DDNS_DATABASE=/data/ddns.sqlite3
+DDNS_DNS_PROVIDER=cloudflare
+DDNS_DNS_ZONES=ddns.example.net
+DDNS_REQUIRE_DNS_PROVIDER=1
+DDNS_CLOUDFLARE_API_TOKEN=change-me-cloudflare-token
+DDNS_CLOUDFLARE_ZONE_ID=change-me-cloudflare-zone-id
+DDNS_TTL=60
+DDNS_RATE_LIMIT_PER_MINUTE=60
+DDNS_CLEANUP_CHALLENGE_HOURS=72
+DDNS_TRUSTED_PROXY_IPS=127.0.0.1,::1