feat(telegram): align global commands with send-only vision

[cryptodj413]

Closes #492
Closes #493
Closes #494

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Summary by cubic

Add Telegram global commands (/start, /help, /settings) with long polling, replying only in the configured chat to keep the bot send-only. Closes #492, #493, #494.

• New Features

  • Set global commands via SetMyCommands.
  • Handle /start, /help, /settings with simple replies; ignore other messages and other chats.

• Refactors

  • Start long polling with a default handler and allow only message updates.
  • Add pollCancel and cancel on Start/Stop to prevent double-start and ensure clean shutdown.

^{Written for commit d4bb6c9. Summary will update on new commits.}

Summary by CodeRabbit

Release Notes

• New Features
  • Telegram bot now responds to /start, /help, and /settings commands with proper handling and error logging.
  • Enhanced bot initialization and lifecycle management for improved stability and command responsiveness.

[coderabbitai]

📝 Walkthrough

Walkthrough

The change adds command handling to the Telegram bot integration. A commandHandler function was created to process /start, /help, and /settings commands, with optional chat-specific filtering. The TelegramOutput struct adds a pollCancel field to manage the long-polling lifecycle. The bot now registers global commands during initialization and starts a polling goroutine. The Start method initializes polling and sets global commands while guarding against double-start. The Stop method cancels active polling before shutdown. Error logging was added for command registration failures.

🚥 Pre-merge checks | ✅ 3 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	The PR addresses issue #492 (global commands) by implementing /start, /help, /settings handlers. However, issue #493 (subscribe/unsubscribe commands) is not implemented in the code changes shown.	Add subscribe and unsubscribe command handlers to fully address issue #493's requirement for user interaction commands.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly relates to the main change: implementing Telegram global commands handling, which aligns with the PR's primary objective.
Out of Scope Changes check	✅ Passed	All changes are scoped to Telegram global command handling and long-polling lifecycle management, which aligns with linked issues #492 and #493.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[cubic-dev-ai]

No issues found across 1 file