feat: initialiser le projet CVP (Next.js 14 + FastAPI + PostgreSQL)

- Frontend : Next.js 14 App Router, TypeScript strict, Tailwind 3, shadcn/ui, next-intl (fr/en)
- Backend : FastAPI, SQLAlchemy 2 async, Alembic, Pydantic 2, Python 3.11
- Infrastructure : Docker Compose (PostgreSQL 16 + Ollama)
- Tooling : ESLint + Prettier (frontend), Ruff (backend), pytest
- Structure complète des dossiers avec pages et routers placeholder

.env.example

@@ -0,0 +1,25 @@
+# PostgreSQL
+POSTGRES_HOST=localhost
+POSTGRES_PORT=5432
+POSTGRES_DB=cvp
+POSTGRES_USER=cvp
+POSTGRES_PASSWORD=cvp_dev_password
+
+# France Travail API
+FRANCE_TRAVAIL_CLIENT_ID=
+FRANCE_TRAVAIL_CLIENT_SECRET=
+
+# Adzuna API
+ADZUNA_APP_ID=
+ADZUNA_APP_KEY=
+
+# Ollama
+OLLAMA_BASE_URL=http://localhost:11434
+OLLAMA_MODEL=phi3:mini
+
+# Backend
+BACKEND_HOST=0.0.0.0
+BACKEND_PORT=8000
+
+# Frontend
+NEXT_PUBLIC_API_URL=http://localhost:8000