Fix connection resets and heartbeat errors

[benrobson]

The application was suffering from instability manifested as read ECONNRESET errors and Discord heartbeat failures. Investigation revealed that the API routes (which the website calls recursively via fetch) were using a buggy callback pattern that often led to multiple response attempts or hanging requests, overwhelming the server and the MySQL connection pool.

This PR fixes these issues by:

• Adding explicit error listeners to the MySQL connection pool and Discord client to prevent unhandled socket errors from destabilizing the process.
• Refactoring the API layer to use modern async/await patterns, ensuring that each request receives exactly one response and that database operations are correctly awaited.
• Cleaning up messy duplicate imports in app.js that could cause multiple module initializations.
• Enhancing security by moving away from string interpolation in SQL queries where possible.

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PR created automatically by Jules for task 17554862004116618049 started by @benrobson

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