feat: enhance error handling for app-proxy with CORS support in internal router configmap #485
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What
This PR updates the internal-router ConfigMap to add CORS headers in the NGINX error handler for /app-proxy.
Why
To allow frontend clients (local.codefresh.io) to receive valid CORS responses even when the backend service is down (502). This avoids CORS-related failures on network errors during preflight or API calls.
Notes