feat(auth): limited RSA support for signing

see server/clippy.toml

server/Cargo.toml

@@ -4,6 +4,9 @@ members = [
 ]
 resolver = "3"
 
+[workspace.lints.clippy]
+disallowed-methods = "deny"
+
 
 [workspace.dependencies]
 tonic = { version = "0.14.3", features = [
@@ -37,3 +40,6 @@ rcgen = { version = "0.14.7", features = [
     "zeroize",
 ], default-features = false }
 k256 = { version = "0.13.4", features = ["ecdsa", "pkcs8"] }
+rsa = { version = "0.9", features = ["sha2"] }
+sha2 = "0.10"
+spki = "0.7"