✨ 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/CodeWorld.vue

@@ -0,0 +1,89 @@
+<template>
+  <div class="code-world font-mono text-sm md:text-base leading-relaxed">
+    <pre
+      class="text-sky-accent whitespace-pre overflow-x-auto max-w-full"
+      :class="{ 'animate-reveal': !reducedMotion }"
+      aria-hidden="true"
+    ><code>{{ visibleCode }}</code></pre>
+
+    <!-- Screen reader alternative -->
+    <p class="sr-only">
+      {{ $t('revelation.codeWorldAlt') }}
+    </p>
+  </div>
+</template>
+
+<script setup lang="ts">
+const emit = defineEmits<{
+  complete: []
+}>()
+
+const reducedMotion = usePreferredReducedMotion()
+
+const asciiArt = `
+           *  .  *
+    *   .        .   *
+         ___
+       /     \\
+      /   ^   \\
+     /    ^    \\
+    /____/ \\____\\
+   |    |   |    |
+   |    |   |    |
+___|    |___|    |___
+      {  YOU  }
+   { FOUND ME! }
+___________________
+`
+
+const visibleCode = ref('')
+const lines = asciiArt.split('\n')
+let currentLine = 0
+
+onMounted(() => {
+  if (reducedMotion.value === 'reduce') {
+    visibleCode.value = asciiArt
+    emit('complete')
+  } else {
+    revealLines()
+  }
+})
+
+function revealLines() {
+  if (currentLine < lines.length) {
+    visibleCode.value += lines[currentLine] + '\n'
+    currentLine++
+    setTimeout(revealLines, 100)
+  } else {
+    setTimeout(() => {
+      emit('complete')
+    }, 500)
+  }
+}
+</script>
+
+<style scoped>
+.code-world {
+  text-align: center;
+}
+
+pre {
+  display: inline-block;
+  text-align: left;
+}
+
+@keyframes reveal {
+  from {
+    opacity: 0;
+    transform: translateY(10px);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0);
+  }
+}
+
+.animate-reveal {
+  animation: reveal 0.3s ease-out;
+}
+</style>