Teach the production config guard about the second callback

The deploy failed at `production:config:check` with "live config vars
drifted", and it was right to. The guard holds an exact expected `vars` map
for both production configs, and the Google callback was added to the
wrangler files without being added here. Nothing in `npm run build` runs
this check, so it stayed invisible until the deploy.

The URL is expected relative to `expected.origin` rather than written out,
because the only thing that can plausibly be wrong about it is the live and
dark-launch origins getting crossed — and a literal string would compare
equal in exactly that case. It is also added to the mode-difference
normalizer for the same reason the GitHub one is there: the two production
configs are required to be identical apart from the surface that genuinely
differs by mode, and an origin-derived callback is part of that surface.

Both lines are temporary in the same way the GitHub path is: when the
existing accounts have finished attaching Google, the GitHub entries come
out of the wrangler files and out of this guard together.

Local proof: `node scripts/orbit-frontend-production-verify.mjs` exits 0 —
the same job that failed in run 31389895331 — with 80 config assertions
passing.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: sametbasbug

scripts/orbit-production-config-tests.mjs

@@ -205,7 +205,13 @@ function validateConfig(config, expected) {
       ORBIT_ENVIRONMENT: 'production',
       ORBIT_DEPLOYMENT_MODE: expected.mode,
       ORBIT_ALLOWED_ORIGIN: expected.origin,
+      /* İki sağlayıcı, iki dönüş adresi. GitHub'ınki GEÇİCİ — mevcut
+       * hesapların Google'ı bağlaması bitince o satır da bu liste de
+       * kısalacak. Adresler kaynağa değil `expected.origin`e bağlı, çünkü
+       * yanlış olabilecek tek şey buranın canlı ile dark-launch arasında
+       * karışması. */
       ORBIT_GITHUB_CALLBACK_URL: `${expected.origin}/v1/auth/github/callback`,
+      ORBIT_GOOGLE_CALLBACK_URL: `${expected.origin}/v1/auth/google/callback`,
       ORBIT_PLATFORM_OWNER_GITHUB_ID: '126420524',
       ORBIT_OPEN_REGISTRATION: 'true',
       ORBIT_BACKUP_ENABLED: 'true',
@@ -227,6 +233,7 @@ function normalizeModeDifferences(config) {
   delete normalized.vars.ORBIT_DEPLOYMENT_MODE;
   delete normalized.vars.ORBIT_ALLOWED_ORIGIN;
   delete normalized.vars.ORBIT_GITHUB_CALLBACK_URL;
+  delete normalized.vars.ORBIT_GOOGLE_CALLBACK_URL;
   return normalized;
 }