feat(Simulator): Add period selection functionality with custom date range support

- Introduced a new PeriodSelector component for selecting date ranges.
- Integrated date range selection into the Simulator page, allowing users to choose between predefined periods (rolling, 2024, 2025) and custom date ranges.
- Updated simulation logic to recalculate based on selected date ranges.
- Added date-fns and react-day-picker dependencies for date handling and UI.
- Enhanced user experience with an information banner detailing the selected simulation period.
- Updated Docker configuration to include environment variables for the web service.

Author: Clément VALENTIN

.claude/rules/dev.md

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+---
+globs:
+  - apps/**/*
+  - docker-compose*.yml
+  - Makefile
+---
+
+# Developpement
+
+## Agents specialises
+
+**Utiliser les agents selon le contexte :**
+
+- **Frontend** (`apps/web/`) : Utiliser l'agent `frontend-specialist`
+- **Backend** (`apps/api/`) : Utiliser l'agent `backend-specialist`
+
+## Auto-reload actif
+
+**Les services sont en auto-reload. NE PAS redemarrer apres modification de code.**
+
+- **Backend** : Uvicorn `--reload` detecte les changements Python
+- **Frontend** : Vite HMR recharge instantanement les composants React
+
+**Redemarrage necessaire uniquement si** :
+
+- Modification `.env.api` ou `.env`
+- Ajout dependances (`pyproject.toml`, `package.json`)
+- Modification `docker-compose.yml` ou `Dockerfile`
+
+## Commandes principales
+
+```bash
+# Demarrage
+make dev              # Start dev avec hot-reload
+make up               # Start tous les services
+make down             # Stop tous les services
+
+# Logs
+make logs             # Tous les logs
+make backend-logs     # Logs backend uniquement
+
+# Database
+make migrate          # Appliquer migrations
+make migrate-revision # Generer nouvelle migration
+make db-shell         # Shell PostgreSQL
+
+# Backend (apps/api/)
+make lint             # ruff + mypy
+make test             # pytest avec coverage
+
+# Frontend (apps/web/)
+npm run lint          # ESLint
+npm run build         # Build production
+```
+
+## Validation
+
+**En fin de traitement, toujours verifier les logs Docker pour valider que tout est OK :**
+
+```bash
+make backend-logs     # Verifier pas d'erreurs backend
+make logs             # Ou tous les logs
+```
+
+## Documentation
+
+**En cas de changement de fonctionnement, mettre a jour la documentation dans `docs/` :**
+
+- `docs/features-spec/` : Specifications fonctionnelles
+- `docs/pages/` : Documentation des pages frontend
+- `docs/setup/` : Installation et configuration
+- `docs/architecture/` : Architecture systeme
+- `docs/enedis-api/` : API Enedis
+- `docs/troubleshooting/` : Resolution de problemes
+
+## Acces
+
+| Service     | URL                          |
+| ----------- | ---------------------------- |
+| Frontend    | <http://localhost:8000>      |
+| Backend API | <http://localhost:8081>      |
+| API Docs    | <http://localhost:8081/docs> |
+| pgAdmin     | <http://localhost:5050>      |