Refactor project structure and update configurations. Now first working version

- Updated `.air.conf` for Nix compatibility and simplified build commands.
- Enhanced `.gitignore` to include `tmp` directory.
- Improved `README.md` with clearer instructions and added language details.
- Refined CSS styles for better UI consistency and added alert styles.
- Upgraded `flake.nix` to use Go 1.24 and improved shell environment setup.
- Modified authentication logic in `auth.go` for better user handling.
- Updated `main.go` to dynamically set the listening port and improved logging.
- Added new `routes.go` file for handling game entry and history.
- Enhanced user models and added statistics tracking in `models.go`.
- Improved template rendering and added user feedback messages in HTML templates.
- Removed obsolete build error logs and binaries.

templates/sent.html

@@ -1,7 +1,7 @@
 {{define "content"}}
 <div class="card">
-    <h2>Check the server logs</h2>
-    <p class="small">We just printed a magic link for <strong>{{.Email}}</strong>. Open it here to sign in.
+    <h2>Check your email inbox</h2>
+    <p class="small">We just printed a magic link for <strong>{{.Email}}</strong>. Open it to sign in.
         Token expires in 30 days.</p>
     <a class="btn" href="/login">Back</a>
 </div>