🛡️ Sentinel: [CRITICAL] Fix Credential Exposure

[keough99]

🚨 Severity: CRITICAL
💡 Vulnerability: The levelerdb setup command accepted sensitive MySQL credentials (including passwords) as plaintext command arguments without restricting execution to Direct Messages (DMs). If run in a public channel, credentials would be exposed to all server members.
🎯 Impact: If exploited, a user running the setup command in a server could inadvertently leak their MySQL host, user, and password to unauthorized users, potentially compromising their entire database.
🔧 Fix: Added a context check (if ctx.guild:) to ensure the command is executed in a Direct Message. If run in a server channel, it deletes the invoking message and returns an error instructing the user to use DMs.
✅ Verification: Tested the cog using py_compile, unit tests, and verified that execution is prevented in server channels by simulating the DM-only conditional block behavior.

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PR created automatically by Jules for task 13600725620545423485 started by @keough99

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