refactor: remove Node.js dependency and update JSON schema tests to use Go-based validation (#563)

Author: creativeprojects

.github/workflows/build.yml

@@ -36,11 +36,6 @@ jobs:
           check-latest: true
           cache: true
 
-      - name: Set up Node.js LTS for running JSON schema tests (using ajv)
-        uses: actions/setup-node@v4
-        with:
-          node-version: "22"
-
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v8
         with: