Fix EU endpoint hostname in README

[devin-ai-integration]

Summary

README's router_base_url example used https://eu.router.requesty.ai, which does not resolve. Corrected to the real EU endpoint https://router.eu.requesty.ai.

Link to Devin session: https://app.devin.ai/sessions/fe2e741019ee465cb3e579b12f5c96e2
Open in Devin Desktop: https://app.devin.ai/desktop/session/fe2e741019ee465cb3e579b12f5c96e2?variant=devin
Requested by: @Thibault00

[devin-ai-integration]

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_{Updated 2026-08-31T14:58Z · last 30 days · data from Requesty}