Add fuzzing suite and ESLint configuration

[marcochan11]

This PR implements fuzzing.

• Added src/fuzz/fuzz-bot.js: A specialized script that dynamically loads all slash commands and injects "garbage" data (null, undefined, SQL injection strings, massive text blobs) to test for unhandled exceptions.
• Added eslint.config.mjs: Configured the static analyzer to identify code smells and technical debt across the project.
• **Updated package.json: Added necessary dependencies for the linter.

Result:
The fuzz-bot.js script successfully identified 8 crashes in the /meme command when handling invalid inputs (e.g., null, undefined). The script confirms that other commands handle edge cases more gracefully.

How to Test

1. Run npm install to get the new linter dependencies.
2. Run node src/fuzz/fuzz-bot.js to see the automated crash report.