Align production origin

[Alimaster30]

What changed

• align the Blueprint service name with the Render dashboard name prepora-io
• replace the unrelated suspended prepora.onrender.com origin with the live prepora-oydp.onrender.com URL
• keep the web canonical origin and coach CORS allowlist consistent
• update the production runbook and Google OAuth origin guidance

Why

The original requested hostname is occupied by an unrelated suspended service. The running Prepora service has a stable Render hostname, and production configuration must use that exact origin.

Validation

• Google OAuth client saved with the live origin
• Render web NEXT_PUBLIC_APP_URL updated
• Render coach BACKEND_ALLOWED_ORIGINS updated
• git diff --check
• npm run lint