Implement RBAC migration and role management enhancements

- Added AJAX functionality to fetch role permissions for copying.
- Introduced system role management with permission checks for updates.
- Implemented role deletion with confirmation modal and backend handling.
- Enhanced user role assignment migration scripts to transition from legacy profiles to RBAC.
- Created SQL migration scripts for user roles and permissions mapping.
- Updated user interface to support new role management features including copy permissions and system role indicators.

index.php

@@ -106,23 +106,28 @@ if (isset($_GET['page']) && $_GET['page'] == 'logout') {
     die();
 }
 
-//=====================================
-//DEFINE WHERE TO SEND THE USER TO. GET first assigned view in the profile if not available use dashboard
-/*=====================================
-$allowed_views = explode(',',$_SESSION['authorization']['profile']);
-$ignoreViews = ['profile','assets','sales'];
-
-// If dashboard is in the profile, prioritize it
-if (in_array('dashboard', $allowed_views) && file_exists('dashboard.php')) {
-    $allowed_views = 'dashboard';
-} else {
-    $allowed_views = findExistingView($allowed_views, 'dashboard', $ignoreViews);
-} 
-*/
 //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 // SIMPLE ROUTING SYSTEM
 //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-$page = $_GET['page'] ?? 'dashboard';
+if (isset($_GET['page'])) {
+    $page = $_GET['page'];
+} else {
+    // Get first available page from user's permissions using the menu structure
+    $default_page = null;
+    if (!empty($_SESSION['authorization']['permissions'])) {
+        include_once dirname(__FILE__).'/settings/settingsmenu.php';
+        $filteredMenu = filterMenuByPermissions($main_menu, $_SESSION['authorization']['permissions']);
+
+        // Get first menu item's URL as default page
+        foreach ($filteredMenu as $section) {
+            if (isset($section['main_menu']['url'])) {
+                $default_page = $section['main_menu']['url'];
+                break;
+            }
+        }
+    }
+    $page = $default_page ?? 'dashboard';
+}
 
 // Sanitize page parameter to prevent directory traversal
 $page = preg_replace('/[^a-zA-Z0-9_-]/', '', $page);
@@ -135,10 +140,6 @@ try {
     $file_exists = file_exists($page_file);
     $is_allowed = $file_exists ? isAllowed($page, $_SESSION['authorization']['permissions'], $_SESSION['authorization']['permission'], 'R') : 0;
 
-    if (debug) {
-        debuglog("Routing: page={$page}, file_exists={$file_exists}, is_allowed={$is_allowed}");
-    }
-
     if ($file_exists && $is_allowed !== 0) {
         include $page_file;
     } else {
@@ -166,9 +167,6 @@ try {
                 <i class="' . $error_icon . '"></i>
             </div>
             <p style="color: var(--gray-500, #6b7280); margin-bottom: 30px;">Please check the URL or navigate using the menu.</p>
-            <a href="index.php?page=dashboard" class="btn">
-                <i class="fa-solid fa-house"></i> Return to Dashboard
-            </a>
         </div>';
         template_footer();
     }
@@ -195,9 +193,6 @@ try {
         </div>
         <p style="color: var(--gray-500, #6b7280); margin-bottom: 30px;">Please try again or contact the system administrator.</p>
         <div style="display: flex; gap: 10px; justify-content: center;">
-            <a href="index.php?page=dashboard" class="btn">
-                <i class="fa-solid fa-house"></i> Return to Dashboard
-            </a>
             <button onclick="location.reload()" class="btn">
                 <i class="fa-solid fa-rotate-right"></i> Reload Page
             </button>