fix(peer): renew expired QUIC dev certificate

Manual peer CLI runs could discover peer advertisements, but QUIC handshakes did
not complete. The checked-in self-signed certificate expired on March 2, 2026,
so peers running on May 17, 2026 could start listening but could not establish
valid TLS sessions with each other.

Regenerate cert.pem from the existing key.pem, preserving the existing subject
and DNS:localhost SAN. The renewed development certificate is valid until April
23, 2126 and still matches key.pem.

Test Plan:
- openssl x509 -in cert.pem -noout -subject -issuer -dates -ext subjectAltName
- openssl x509 -noout -modulus -in cert.pem | openssl sha256
- openssl rsa -noout -modulus -in key.pem | openssl sha256
- just peer-cli-image
- just peer-cli-alpha, just peer-cli-bravo, just peer-cli-charlie

Refs: PEER_CLI_SCENARIOS.md

cert.pem

@@ -1,35 +1,35 @@
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 -----END CERTIFICATE-----