Add TuxiNet branding and document templates

app/Core/Database.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace App\Core;
+
+use PDO;
+use PDOException;
+
+class Database
+{
+    private static ?PDO $connection = null;
+
+    public static function connection(): PDO
+    {
+        if (self::$connection === null) {
+            $config = config('database');
+
+            $dsn = sprintf(
+                'mysql:host=%s;port=%s;dbname=%s;charset=utf8mb4',
+                $config['host'],
+                $config['port'],
+                $config['database']
+            );
+
+            $options = [
+                PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
+                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+                PDO::ATTR_EMULATE_PREPARES => false,
+            ];
+
+            try {
+                self::$connection = new PDO(
+                    $dsn,
+                    $config['username'],
+                    $config['password'],
+                    $options
+                );
+            } catch (PDOException $exception) {
+                throw new \RuntimeException('Database connection failed: ' . $exception->getMessage());
+            }
+        }
+
+        return self::$connection;
+    }
+}