umputun / tg-spam / 17341879765

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Add aggressive spam cleanup feature (#316)

* Add aggressive cleanup to delete spammer's message history

Implement optional aggressive cleanup feature that deletes all recent
messages from a spammer when banned via /spam or /ban commands.

Features:
- Asynchronous deletion in background goroutine (non-blocking)
- Rate limiting at 30 messages/second to respect Telegram API limits
- Consecutive failure handling with 5-strike limit
- Configurable message limit (default: 100, max: 10000)
- Admin chat notification showing deletion count
- Database indexes for efficient message queries

Configuration:
- --aggressive-cleanup: enable the feature (default: disabled)
- --aggressive-cleanup-limit: max messages to delete per user

Includes comprehensive tests for deletion logic, error handling, and
rate limiting scenarios.

* Remove unnecessary configuration validation for aggressive cleanup limit

The validation was inconsistent with the rest of the codebase which trusts user configuration and relies on defaults.

* Clarify rate limiting comment to reflect actual rate

The comment now accurately states that we use 35ms delay (~28.6 msg/sec)
to stay safely below Telegram's 30 msg/sec limit, rather than implying
we hit exactly 30 msg/sec.

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