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.

assets/styles.css

@@ -42,12 +42,42 @@ body {
 }
 
 .input {
-    width: 100%;
+    width: 75%;
     padding: 10px;
     border-radius: 10px;
     border: 1px solid #ddd
 }
 
+a, a:link, a:visited, a:hover, a:active {
+  color: darkblue;      /* always dark blue */
+  text-decoration: none; /* remove underline */
+}
+
+.alert {
+  padding: 10px 14px;
+  border-radius: 6px;
+  margin: 10px 0;
+  font-size: 0.9rem;
+}
+
+.alert-error {
+  background: #ffe5e5;
+  border: 1px solid #e74c3c;
+  color: #c0392b;
+}
+
+.alert-success {
+  background: #e6ffed;
+  border: 1px solid #2ecc71;
+  color: #27ae60;
+}
+
+.alert-info {
+  background: #eaf4ff;
+  border: 1px solid #3498db;
+  color: #2980b9;
+}
+
 .label {
     font-size: 12px;
     color: #444;