fix(http3): rcgen 0.14 CertifiedKey API for http3-dev CI builds

Author: Tuntii

CHANGELOG.md

@@ -22,6 +22,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- **`rcgen` 0.14 HTTP/3 dev certs**: `generate_self_signed_cert` uses `CertifiedKey { cert, signing_key }` so `--all-features` / `http3-dev` builds pass CI again.
 - **Security Audit** (`cargo audit`) passes on the current lockfile (no high-severity `quick-xml` advisories).
 
 ## [0.1.551] - 2026-07-05

crates/rustapi-core/src/http3.rs

@@ -411,9 +411,10 @@ impl Http3Server {
         (CertificateDer<'static>, PrivateKeyDer<'static>),
         Box<dyn std::error::Error + Send + Sync>,
     > {
-        let cert = rcgen::generate_simple_self_signed(vec!["localhost".to_string()])?;
-        let key = PrivateKeyDer::Pkcs8(cert.key_pair.serialize_der().into());
-        let cert = CertificateDer::from(cert.cert.der().to_vec());
+        let rcgen::CertifiedKey { cert, signing_key } =
+            rcgen::generate_simple_self_signed(vec!["localhost".to_string()])?;
+        let key = PrivateKeyDer::Pkcs8(signing_key.serialize_der().into());
+        let cert = CertificateDer::from(cert.der().to_vec());
 
         Ok((cert, key))
     }