🛡️ Sentinel: [CRITICAL] Fix credential exposure in levelerdb setup

[keough99]

🚨 Severity: CRITICAL
💡 Vulnerability: The levelerdb setup command accepted sensitive MySQL database credentials as plaintext arguments. If a user accidentally ran this command in a public server channel, those credentials would be exposed in the channel's message history.
🎯 Impact: Anyone with access to the channel history could view the database credentials (host, username, password), leading to complete database compromise.
🔧 Fix: Modified the levelerdb_setup command to explicitly check if ctx.guild:. If so, it attempts to delete the user's message immediately and returns an error instructing the user to run the command in Direct Messages.
✅ Verification: Review the code to ensure the if ctx.guild: block is present in levelerdb_setup, correctly deletes the message, and returns an early error message.

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PR created automatically by Jules for task 10140114709980761337 started by @keough99

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