✨ 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>

frontend/app/components/feature/ZoneEndChoice.vue

@@ -0,0 +1,37 @@
+<template>
+  <div class="zone-end-choice py-16 px-4 border-t border-sky-dark-100 mt-16">
+    <div class="max-w-2xl mx-auto">
+      <!-- Choix binaire -->
+      <FeatureChoiceCards
+        v-if="choicePoint && choicePoint.choices[0].id !== choicePoint.choices[1].id"
+        :choice-point="choicePoint"
+      />
+
+      <!-- Si une seule destination (contact) -->
+      <div
+        v-else-if="choicePoint"
+        class="text-center"
+      >
+        <p class="font-narrative text-xl text-sky-text mb-8 italic">
+          {{ locale === 'fr' ? choicePoint.questionFr : choicePoint.questionEn }}
+        </p>
+
+        <NuxtLink
+          :to="localePath(choicePoint.choices[0].destination)"
+          class="inline-flex items-center gap-3 px-8 py-4 bg-sky-accent text-sky-dark font-ui font-semibold rounded-xl hover:opacity-90 transition-opacity focus-visible:outline-2 focus-visible:outline-sky-accent focus-visible:outline-offset-2"
+        >
+          <span class="text-2xl">{{ choicePoint.choices[0].icon }}</span>
+          <span>{{ locale === 'fr' ? choicePoint.choices[0].textFr : choicePoint.choices[0].textEn }}</span>
+        </NuxtLink>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+const { getNextChoicePoint } = useNarrativePath()
+const { locale } = useI18n()
+const localePath = useLocalePath()
+
+const choicePoint = computed(() => getNextChoicePoint())
+</script>