feat: Release version 3.1.4 - Mode terrain et génération PDF

✨ Nouvelles fonctionnalités:
- Ajout du mode terrain pour utilisation mobile hors connexion
- Génération automatique de reçus PDF avec template personnalisé
- Révision complète du système de cartes avec amélioration des performances

🔧 Améliorations techniques:
- Refactoring du module chat avec architecture simplifiée
- Optimisation du système de sécurité NIST SP 800-63B
- Amélioration de la gestion des secteurs géographiques
- Support UTF-8 étendu pour les noms d'utilisateurs

📱 Application mobile:
- Nouveau mode terrain dans user_field_mode_page
- Interface utilisateur adaptative pour conditions difficiles
- Synchronisation offline améliorée

🗺️ Cartographie:
- Optimisation des performances MapBox
- Meilleure gestion des tuiles hors ligne
- Amélioration de l'affichage des secteurs

📄 Documentation:
- Ajout guide Android (ANDROID-GUIDE.md)
- Documentation sécurité API (API-SECURITY.md)
- Guide module chat (CHAT_MODULE.md)

🐛 Corrections:
- Résolution des erreurs 400 lors de la création d'utilisateurs
- Correction de la validation des noms d'utilisateurs
- Fix des problèmes de synchronisation chat

🤖 Generated with Claude Code (https://claude.ai/code)

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

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