feat(quic): enable HTTP/3 over QUIC on the edge + versioned images
HTTP/3 is config-only — the Debian haproxy package is built +QUIC via the OpenSSL compat shim. Changes: - hap_header.tpl: `limited-quic` (required to enable QUIC binds under the compat layer) + self-healing `cluster-secret` for QUIC token derivation. - hap_listener.tpl: `bind quic4@:443 ... alpn h3` in the shared frontend (so real-IP/rate-limit/IP-block/Coraza rules apply to H3 too) + alt-svc header. - Dockerfile/README: publish/document 443/udp; stamp image.version from VERSION. - CI: tag :latest + :<VERSION> + :<sha> so there's a pinnable rollback target. No 0-RTT (compat-layer limitation). Validated end-to-end on a standalone edge: config parses, UDP/443 binds, alt-svc advertised, real curl --http3 -> HTTP/3. Container must run with `-p 443:443/udp` + host UDP/443 open. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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