✨ 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/i18n/en.json

@@ -179,6 +179,16 @@
     "clickToSkip": "Click or press Space to skip",
     "bugAlt": "The Bug - Stage {stage}"
   },
+  "intro": {
+    "continue": "Continue",
+    "startExploring": "Start exploring",
+    "skip": "Skip intro",
+    "fallback": {
+      "seq1": "Welcome to my domain... I am The Bug, your guide for this adventure.",
+      "seq2": "There's someone here you're looking for... A mysterious developer who created everything you see.",
+      "seq3": "To find them, explore this world. Each zone hides a part of their story. Are you ready?"
+    }
+  },
   "map": {
     "ariaLabel": "Interactive portfolio map. Use Tab to navigate between zones and Enter to explore.",
     "instructions": "Use Tab keys to navigate between zones and Enter or Space to explore a zone.",
@@ -252,5 +262,63 @@
       "title": "Quick Resume",
       "description": "The essentials at a glance"
     }
+  },
+  "easterEgg": {
+    "found": "Easter Egg found!",
+    "count": "{found} / {total} discovered",
+    "difficulty": "Difficulty",
+    "collection": "My Collection",
+    "allFound": "Collection complete! You're a true explorer!",
+    "hint": "Keep exploring... surprises are hidden everywhere!"
+  },
+  "challenge": {
+    "title": "One last challenge...",
+    "intro": "Before meeting the developer, prove you understand the basics of code. Nothing too hard, I promise.",
+    "accept": "Accept the challenge",
+    "skip": "Skip to contact",
+    "puzzleTitle": "Put the code in order",
+    "puzzleInstruction": "Drag the lines to reconstruct the function that unlocks access to the developer.",
+    "hint1": "The function starts with function unlockDeveloper() {",
+    "hint2": "The secret variable is defined right after the opening brace",
+    "hint3": "The last line before the closing brace is return Keep exploring...",
+    "hintLabel": "Hint",
+    "needHint": "Need help?",
+    "validate": "Check",
+    "validating": "Checking...",
+    "wrongOrder": "That's not the right order... Try again!",
+    "moveUp": "Move up",
+    "moveDown": "Move down",
+    "success": "Well done!",
+    "successMessage": "You've proven your worth. The path to the developer is now open...",
+    "redirecting": "Redirecting..."
+  },
+  "revelation": {
+    "loading": "Loading...",
+    "bugSays": "The Bug says: You found them!",
+    "foundMe": "You found me!",
+    "message": "Welcome to my world of code. Thank you for exploring all this way to find me.",
+    "contactCta": "Contact me",
+    "srDescription": "Revelation page. You found the developer Celian. A button allows you to contact them.",
+    "codeWorldAlt": "An ASCII art world representing a code landscape with the message You found me in the center."
+  },
+  "contact": {
+    "statsTitle": "Your journey",
+    "zones": "Zones visited",
+    "easterEggs": "Easter eggs",
+    "challenge": "Challenge",
+    "title": "Contact me",
+    "subtitle": "Congratulations for exploring all this way! I'd be happy to chat with you.",
+    "name": "Name",
+    "namePlaceholder": "Your name",
+    "email": "Email",
+    "emailPlaceholder": "your.email(at)example.com",
+    "message": "Message",
+    "messagePlaceholder": "What brings you here?",
+    "send": "Send",
+    "sending": "Sending...",
+    "success": "Message sent!",
+    "successMessage": "Thanks for your message. I'll get back to you as soon as possible.",
+    "error": "An error occurred. Please try again later.",
+    "rateLimitError": "Too many attempts. Please wait a moment before trying again."
   }
 }