feat: add puzzle component and image upload functionality

- Introduced a new Puzzle component for interactive puzzle gameplay.
- Updated StepForm to include fields for puzzle image and number of pieces.
- Implemented image upload handling in the server-side logic for steps.
- Enhanced database schema to store image URLs and puzzle piece counts.
- Added file upload utilities for managing uploaded images.
- Created routes for serving uploaded images securely.
- Updated game play routes to handle puzzle completion logic.
- Improved error handling for image uploads and puzzle configurations.

.env.example

@@ -7,3 +7,10 @@ ORIGIN=""
 # For production use 32 characters and generated with high entropy
 # https://www.better-auth.com/docs/installation
 BETTER_AUTH_SECRET=""
+
+# Uploads
+UPLOAD_DIR="./uploads"
+
+# Upload Directory
+# Path to store uploaded files (defaults to ./uploads if not set)
+UPLOAD_DIR=""