debug: add parser logging + enable url2green API

- parser.js: log found files, top-level JSON keys, and extracted
  metric values to stdout (visible via docker logs speedboard)
- runner.js: add --sustainable.useGreenWebHostingAPI flag

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

runner.js

@@ -19,6 +19,7 @@ export function runTest(job, onLine) {
       '--outputFolder', outputFolder,
       '--json',
       '--sustainable.enable',
+      '--sustainable.useGreenWebHostingAPI',
       '--axe.enable',
       '--coach',
     ];