Add Discord.js bot base with prefix commands and Winston logging

Co-authored-by: yhqe <139268606+yhqe@users.noreply.github.com>

.env.example

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+# Discord Bot Token — get yours at https://discord.com/developers/applications
+BOT_TOKEN=your_bot_token_here
+
+# Command prefix (default: !)
+PREFIX=!
+
+# Guild ID for test server (optional — used for dev utilities)
+GUILD_ID=your_guild_id_here