Add error log management and bulk admin actions

Introduces error log tracking with new ErrorLog model, controller, views, and migration. Adds admin UI for viewing, resolving, and deleting errors. Implements bulk actions for users and notification groups, refactors domain filtering/pagination, and centralizes admin access checks using Auth::requireAdmin().

public/index.php

@@ -5,12 +5,32 @@ require_once __DIR__ . '/../vendor/autoload.php';
 use Core\Application;
 use Core\Router;
 use Dotenv\Dotenv;
+use App\Services\ErrorHandler;
 
 define('PATH_ROOT', __DIR__ . '/../');
 
-// Load environment variables
+// Register global error handlers FIRST (before anything else can fail)
+ErrorHandler::register();
+
+// Load environment variables (using safeLoad to not throw if missing)
 $dotenv = Dotenv::createImmutable(__DIR__ . '/..');
-$dotenv->load();
+try {
+    $dotenv->load();
+} catch (\Throwable $e) {
+    // If .env is missing, create a minimal one or use defaults
+    if (!file_exists(__DIR__ . '/../.env')) {
+        // Show helpful error about missing .env file
+        throw new \Exception(
+            ".env file not found! Please copy env.example.txt to .env and configure your settings.\n\n" .
+            "Quick fix:\n" .
+            "1. Copy env.example.txt to .env\n" .
+            "2. Update database credentials in .env\n" .
+            "3. Set APP_ENV=development or production\n\n" .
+            "Original error: " . $e->getMessage()
+        );
+    }
+    throw $e;
+}
 
 // Configure and start session (with database sessions if available)
 Core\SessionConfig::configure();