Fix redeem command parsing: handle /redeem and multiline keys correctly

[PvlMamaev]

This pull request fixes an issue where the /redeem command was not working properly due to incorrect key parsing and command matching logic.

Changes introduced:

• Replaced basic regex parsing with _normalize_keys() to correctly extract CD-keys (5-5-5 format), even from multiline messages or with unusual formatting.
• Added support for parsing redeem commands that use / instead of !, which previously caused crashes.
• Replaced deprecated set(_REGEX_CDKEY.findall(...)) logic with more robust normalization that avoids assertion errors in ASFConnector.

Tested locally with both /redeem and !redeem commands — now works as expected.

Let me know if anything needs to be adjusted!

[dmcallejo]

Hello! Thank you for taking your time and submit a PR. I was not aware of these issues.
In fact I cannot replicate the !redeem /redeem command

[PvlMamaev]

Hi! I’d like to withdraw this pull request for now.

After further testing, I realized that the original /redeem and !redeem commands do in fact work correctly under certain conditions. It seems the issue I was experiencing may have been related to my server environment, not the bot logic itself.

At this point, I cannot confidently say that the changes in this PR are necessary or beneficial. I will continue investigating the environment-specific issues on my side and might submit a more focused improvement in the future if needed.

Thanks again for your time and understanding!

[dmcallejo]

Thank you for your time anyway!