✨ feat(epic-4): chemins narratifs, easter eggs, challenge et contact

Epic 4: Chemins Narratifs, Challenge & Contact

Stories implementees:
- 4.1: Composant ChoiceCards pour choix narratifs binaires
- 4.2: Sequence d'intro narrative avec Le Bug
- 4.3: Chemins narratifs differencies avec useNarrativePath
- 4.4: Table easter_eggs et systeme de detection (API + composable)
- 4.5: Easter eggs UI (popup, notification, collection)
- 4.6: Page challenge avec puzzle de code
- 4.7: Page revelation "Monde de Code"
- 4.8: Page contact avec formulaire et stats

Fichiers crees:
- Frontend: ChoiceCards, IntroSequence, ZoneEndChoice, EasterEggPopup,
  CodePuzzle, ChallengeSuccess, CodeWorld, et pages intro/challenge/revelation
- API: EasterEggController, Model, Migration, Seeder

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

api/app/Http/Controllers/Api/EasterEggController.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace App\Http\Controllers\Api;
+
+use App\Http\Controllers\Controller;
+use App\Models\EasterEgg;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+
+class EasterEggController extends Controller
+{
+    /**
+     * Liste les easter eggs actifs (sans révéler les récompenses)
+     */
+    public function index(): JsonResponse
+    {
+        $easterEggs = EasterEgg::active()
+            ->select('slug', 'location', 'trigger_type', 'difficulty')
+            ->get();
+
+        return response()->json([
+            'data' => $easterEggs,
+            'meta' => [
+                'total' => $easterEggs->count(),
+            ],
+        ]);
+    }
+
+    /**
+     * Valide un easter egg et retourne la récompense
+     */
+    public function validate(Request $request, string $slug): JsonResponse
+    {
+        $easterEgg = EasterEgg::active()->where('slug', $slug)->first();
+
+        if (!$easterEgg) {
+            return response()->json([
+                'error' => [
+                    'code' => 'EASTER_EGG_NOT_FOUND',
+                    'message' => 'Easter egg not found or inactive',
+                ],
+            ], 404);
+        }
+
+        $lang = app()->getLocale();
+        $reward = $easterEgg->getReward($lang);
+
+        return response()->json([
+            'data' => [
+                'slug' => $easterEgg->slug,
+                'reward_type' => $easterEgg->reward_type,
+                'reward' => $reward,
+                'difficulty' => $easterEgg->difficulty,
+            ],
+        ]);
+    }
+}