Add roadmap management feature with database schema and user management

- Implemented roadmap.php for displaying and managing roadmap items with filters for quarter and status.
- Created schema.sql to define the database structure for users, invites, daily plans, tasks, brainstorm sessions, brainstorm cards, roadmap items, and integrations.
- Developed users.php for admin panel to manage team members and invitations, including functionality to create and revoke invites.

config/config.php

@@ -0,0 +1,40 @@
+<?php
+/**
+ * Fociz Applicatie- en Databaseconfiguratie
+ */
+
+// Automatisch eenvoudige .env ondersteuning indien aanwezig
+$envFile = __DIR__ . '/../.env';
+if (file_exists($envFile)) {
+    $lines = file($envFile, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
+    foreach ($lines as $line) {
+        if (str_starts_with(trim($line), '#')) continue;
+        if (strpos($line, '=') !== false) {
+            list($name, $value) = explode('=', $line, 2);
+            $name = trim($name);
+            $value = trim($value, " \t\n\r\0\x0B\"'");
+            if (!array_key_exists($name, $_SERVER) && !array_key_exists($name, $_ENV)) {
+                putenv(sprintf('%s=%s', $name, $value));
+                $_ENV[$name] = $value;
+                $_SERVER[$name] = $value;
+            }
+        }
+    }
+}
+
+// MariaDB Verbindingsgegevens (pas deze aan naar uw server instellingen of gebruik .env)
+define('DB_HOST', getenv('DB_HOST') ?: '127.0.0.1');
+define('DB_PORT', getenv('DB_PORT') ?: '3306');
+define('DB_NAME', getenv('DB_NAME') ?: 'fociz');
+define('DB_USER', getenv('DB_USER') ?: 'root');
+define('DB_PASS', getenv('DB_PASS') !== false ? getenv('DB_PASS') : '');
+define('DB_CHARSET', 'utf8mb4');
+
+// Applicatie instellingen
+define('APP_NAME', 'Fociz');
+define('APP_URL', getenv('APP_URL') ?: ((isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on' ? 'https://' : 'http://') . ($_SERVER['HTTP_HOST'] ?? 'localhost')));
+define('APP_SECRET', getenv('APP_SECRET') ?: 'fociz-maria-db-super-secret-key-998877');
+
+// Tijdzone
+date_default_timezone_set('Europe/Amsterdam');
+