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- Add TelegramAuthPayloadBuilder in GmRelay.Shared for C# tests. - Refactor TelegramAuthServiceTests to use the shared builder. - Add Python equivalent (telegram_init_data.py) for E2E runner. - Add self-contained Python tests and E2E README. Closes #144 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>