Limit notifications to the initial login step of the workflow

Modify api.py to only send Telegram notifications for the first step of a multi-step submission, preventing duplicate notifications for subsequent steps.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 85ebbae1-0e85-4065-9590-01170cd61715
Replit-Commit-Checkpoint-Type: full_checkpoint
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