Review and Fixes for commit aeb7fec

[xevfx]

I have completed the review of commit aeb7fec and applied several critical fixes and improvements.

Summary of Findings & Fixes:

1. Persistence Improvements (Giveaway Cog):

   • The original commit tracked giveaway participants only in memory. I implemented database-backed persistence so that participant lists are saved on join/leave and restored when the cog loads.
   • Fixed a bug where bot.get_cog("Giveaway") would return None because the cog was named UserAppGiveaway. I explicitly set the name to "Giveaway".
   • Added cache invalidation for giveaway counts to ensure the 10-giveaway limit is enforced correctly.

2. Code Smells & Shadowing (Main):

   • Resolved the shadowing of the Amenity class by renaming the instance to bot in main.py.
   • Ensured load_dotenv() is called before bot instantiation to guarantee environment variables are available during initialization.

3. Efficiency (Crypto Cog):

   • Optimized the _get_coin_id logic. Instead of three separate full-list iterations, it now uses a more streamlined approach for matching IDs, names, and symbols.

4. Game Logic (Games Cog):

   • Verified the fix for Blackjack's cross-server compatibility and confirmed the use of .id for reliable user comparisons.

5. Cleanliness:

   • Removed the commit_diff.patch file which was accidentally included as a meta-artifact.

All changes have been verified with existing tests.

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PR created automatically by Jules for task 14325029123371322578 started by @xevfx

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