refactor: introduce commands.Cog

[Nanahuse]

src/countdown_cog.py is renamed from src/countdown_bot.py. Its logic is not changed.

main.py load all environment variables.

src/log_handler.py
bot argument is removed. Because it can load from ctx

[Copilot]

Pull request overview

This PR refactors the Discord bot codebase from a module-level command pattern to a more modular Cog-based architecture. The main countdown bot functionality is moved from src/countdown_bot.py to src/countdown_cog.py as a commands.Cog subclass, while bot initialization is centralized in src/main.py. The LogHandler class is also refactored to store the bot reference internally rather than requiring it as a parameter to each method call.

Key changes:

• Introduced CountdownCog class to encapsulate countdown commands using the discord.py Cog pattern
• Centralized bot initialization and configuration in main.py
• Refactored LogHandler to store bot reference in constructor, simplifying method signatures

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/main.py	Added bot initialization, logger setup, and cog registration logic
src/countdown_cog.py	New file containing CountdownCog class with rc and vrc commands migrated from countdown_bot.py
src/countdown_bot.py	Deleted file - functionality moved to countdown_cog.py
src/log_handler.py	Refactored to accept bot in constructor and removed bot parameter from logging methods
src/load_env.py	Changed load_bot_token() to return None instead of raising exception when token not found
uv.lock	Updated package name from "workspace" to "racebot"
pyproject.toml	Added docstring-code-format configuration for Ruff
.devcontainer/devcontainer.json	Added editor settings for formatting and linting

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[Copilot]

@Nanahuse I've opened a new pull request, #5, to work on those changes. Once the pull request is ready, I'll request review from you.