🛡️ Sentinel: [CRITICAL] Fix Credential Exposure in Database Setup

[keough99]

🚨 Severity: CRITICAL
💡 Vulnerability: The levelerdb setup command accepts sensitive MySQL database credentials (password) as plaintext arguments. If a bot owner runs this command in a public channel, these credentials are leaked in the server's message history.
🎯 Impact: Anyone with access to the channel could view the plaintext database password and potentially gain unauthorized access to the bot's backend database, compromising all leveling data.
🔧 Fix: Enforced execution in Direct Messages by returning early if ctx.guild:. If the command is accidentally run in a guild, it attempts to delete the message (await ctx.message.delete()) to remove the credentials from history and sends a warning to the user.
✅ Verification: Review the levelerdb_setup command in leveler/commands.py to ensure the if ctx.guild: block is present and properly handles message deletion and early return.

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PR created automatically by Jules for task 16471679544435274264 started by @keough99

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