fix: add @typescript/typescript6 companion package for TypeScript 7 build tooling compatibility

Author: Copilot

package.json

@@ -53,6 +53,7 @@
     "@types/supertest": "^7.0.0",
     "@typescript-eslint/eslint-plugin": "^8.0.0",
     "@typescript-eslint/parser": "^8.0.0",
+    "@typescript/typescript6": "^6.0.2",
     "@vitest/coverage-v8": "4.1.8",
     "eslint": "^10.0.0",
     "globals": "^17.0.0",