Complete TP7 TP8 authentication authorization and classic CSS

mini-crm/database/migrations/2026_10_20_223959_add_is_admin_to_users_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('users', function (Blueprint $table) {
+            // TP8 : les comptes standards ne reçoivent jamais les droits administrateur par défaut.
+            $table->boolean('is_admin')->default(false);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('users', function (Blueprint $table) {
+            $table->dropColumn('is_admin');
+        });
+    }
+};