feat: add initial setup for KrothiumAPI with .htaccess and index.php

- Created .htaccess for URL rewriting to route all requests to index.php
- Added index.php to bootstrap the KrothiumAPI with environment variables and configuration settings
- Configured application mode, paths, router settings, session management, error logging, and logging driver

.htaccess

@@ -0,0 +1,9 @@
+<IfModule mod_rewrite.c>
+    RewriteEngine On
+
+    # Se já estiver na pasta public, não reescreve novamente
+    RewriteRule ^public(/.*)?$ - [L]
+
+    # Reescreve tudo para a pasta public
+    RewriteRule ^(.*)$ public/$1 [L]
+</IfModule>