Allow revoking Telegram bot access from Telegram (revoke-only)

Summary

Currently, Telegram channel access (allowlist) can only be managed from the terminal via /telegram:access. It would be useful to allow revoking access directly from Telegram itself.

Rationale

• Revoking access is a safe, permission-reducing action — no security risk
• Users may want to disable the bot when away from their computer (e.g., from their phone via Telegram)
• Granting access should still remain terminal-only for security

Proposed behavior

• Allow a command from Telegram (e.g., /revoke or /stop) to remove the sender from the allowlist
• Re-enabling would still require running /telegram:access from the terminal

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