Migrate internal RPC routes from magic strings to constants

[dotandev]

Stop maintaining hardcoded URLs throughout the Go client and put them in a centralized endpoints definition file.

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[codewithzubair07]

@codewithzubair07 has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

I’d like to work on this issue (#577).

I will audit the existing SDK types, extend them to support concurrent execution contexts in tests without breaking the public interface, add appropriate tests/benchmarks, and update the relevant architecture documentation.

ETA: 24 hours. 🚀

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Congratulations, @codewithzubair07! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

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