Reduce getConfig API calls by using parent route values

[rbren]

This PR optimizes the config loading by:

1. Removing duplicate getConfig() calls in child routes
2. Using the config values already stored in window globals from the parent route
3. Adding proper TypeScript type declarations for the global variables

This change will reduce the number of API calls made to get the config, improving performance while maintaining the same functionality.

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To run this PR locally, use the following command:

docker run -it --rm   -p 3000:3000   -v /var/run/docker.sock:/var/run/docker.sock   --add-host host.docker.internal:host-gateway   -e SANDBOX_RUNTIME_CONTAINER_IMAGE=docker.all-hands.dev/all-hands-ai/runtime:48de691-nikolaik   --name openhands-app-48de691   docker.all-hands.dev/all-hands-ai/openhands:48de691

[rbren]

I think this is the wrong fix