Hello!)
I"m very happy with the first PR, but at first glance it seems that the code was written using artificial intelligence, such as Copilot or ChatGPT. But maybe I"m wrong)
Then let"s go through your changes and code (which I tested too):

1. Removed unnecessary imports to clean up the code.
   (-+)

• Some imports that you removed are really unnecessary (for now), such as:
  embed, Administration, Auth
• However, why import discord entirely, if you can import each element separately, and not assign discord. each time
• And you deleted the main service on which the entire music application is built:
  from vkpymusic import Service

2. Moved the token and admin user ID to variables for better security. It"s essential to store the token securely, like using environment variables.
   (+-)
   Yes, you are right, but for students it is easier to use TOKEN not from the variable environment via os.get_env(), but through a variable from a special file - Settings.py.
3. Simplified the on_ready function for setting the bot"s activity.
   (+-)
   And here again you are right, however, we plan to use several different views through the list, as seen in the original code.
4. Defined the reload_extensions command to reload cogs and make it more explicit.
   (-)

• You rewrote the command, completely “breaking” the slash command and turning it into a regular one, using an outdated Context.
• Teams are not synchronized with the team tree and no longer appear in chats.

5. Updated code structure and removed unused code for improved readability.
   (-)
   Yes, this is unused code, but necessary! There are different methods for different tasks, for example, Synchronization for one guild and many
6. Updated the way extensions are loaded and reloaded for better handling of cogs.
   (-)

• Adding cogs without await and before launching the bot? - Very doubtful. There were no errors during the test, but the cogs did not connect.
• Reload cogs is now a regular command, not a slash command. Also without await...

7. Added a check for the ADMIN_USER_ID to block mentions.
   (-+)
   You changed the logic of the code, it was planned that it was forbidden to tag a person with the admin ID, and not the bot itself.
   The bot now prohibits tagging itself.
8. Improved code readability, comments, and adhered to PEP 8 style guidelines.
   (+++)
   Yes, I completely agree here :)
9. My personal additional comments:

• all slash commands do not work :(
• now you can tag me :(
• now the bot does not use entertainment content
• error support removed:

self.tree.on_error = on_tree_error
...

async def on_tree_error(interaction: Interaction, error: app_commands.AppCommandError):
     if isinstance(error, app_commands.CommandOnCooldown):
         await interaction.channel.send(
             f"Command is currently on cooldown! Try again in **{error.retry_after:.2f}** seconds!"
         )

     elif isinstance(error, app_commands.CommandNotFound):
         await interaction.channel.send(error)

     else:
         await interaction.channel.send(error)

     if not interaction.response.is_done():
         await interaction.response.send_message(content="Something went wrong!", ephemeral=True)

• INITIALIZATION OF MUSIC SERVICE IS REMOVED:

     # set services
     voice: Voice = client.get_cog("Voice")
     for guild in client.guilds:
         service: Service = Service.parse_config(rf"tokens/{guild.id}.ini")
         if service is not None:
             await voice.set_service(guild.id, service)
             print(f"\033[92mGuild {guild.name} connected!\033[0m")

Regarding the latter, there was a big aftertaste, because... the service was created mainly for music, and without it it will not work (