Stacks over #63

Improve Type Safety and Code Quality

Changes

• Enhanced type safety by adding TextChannel type casting for interaction.channel usage across commands
• Removed unused poll command and related EMOJI_NUMBERS constants to reduce code bloat
• Strengthened type definitions by replacing any with unknown and making DiscordEvent generic
• Added runtime validation in interaction handler to ensure commands have proper execute functions
• Improved API response typing with proper type assertions for mentorship and warning endpoints

Technical Details

• Added TODO comments for future channel type validation improvements
• Updated Discord.js module declarations for better type inference
• Enhanced error handling in command execution flow
• This PR focuses on making the codebase more maintainable and type-safe without introducing breaking changes to functionality.