Initial sign endpoint working

package.json

@@ -112,6 +112,7 @@
         "reodotdev": "1.0.0",
         "resend": "6.9.2",
         "semver": "7.7.4",
+        "sshpk": "^1.18.0",
         "stripe": "20.3.1",
         "swagger-ui-express": "5.0.1",
         "tailwind-merge": "3.4.0",
@@ -152,6 +153,7 @@
         "@types/react": "19.2.14",
         "@types/react-dom": "19.2.3",
         "@types/semver": "7.7.1",
+        "@types/sshpk": "^1.17.4",
         "@types/swagger-ui-express": "4.1.8",
         "@types/topojson-client": "3.1.5",
         "@types/ws": "8.18.1",