Add endpoints for Waldo finders and selection evaluation with character data seeding

[hussein-m-kandil]

This pull request adds core features needed for the game backend: seed data for characters' rects (boundaries pixel-position), endpoints to manage character finders and evaluate selections, and improvements to tests and middleware.

What’s new:

• Seeds characters' data if missing, ensuring the game map is populated.
• Creates the CharacterFinder model and adds endpoints to get, create, or update a finder record for each user/game.
• Adds an evaluation endpoint that checks a user’s selection box against the stored character’s position and returns feedback.
• Remove any game that has been open for at least two days and has not ended yet.
• Updates the visitor-registrar middleware to ignore /characters routes.
• Refactors integration tests to use a custom app instance, aligning with new routes and logic.
• Updated Prisma dependencies.