feat : init project Coltura (CRM/ERP)

Symfony 8 + API Platform 4 + Nuxt 4 monorepo.
Backend: User entity, JWT auth, fixtures.
Frontend: login, dashboard, auth middleware, i18n, @malio/layer-ui.
Docker: dev (ports 8083/3003/5436) + prod multi-stage.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

README.md

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+# Coltura
+
+CRM/ERP - Symfony 8 + API Platform 4 + Nuxt 4
+
+## Quick Start
+
+```bash
+make start    # Start Docker containers
+make install  # Install dependencies, run migrations, build frontend
+```
+
+Dev frontend: `make dev-nuxt` (hot reload on port 3003)
+
+## Ports
+
+| Service  | Port |
+|----------|------|
+| API      | 8083 |
+| Frontend | 3003 |
+| PostgreSQL | 5436 |
+
+## Credentials (dev)
+
+- admin / admin (ROLE_ADMIN)
+- alice / alice (ROLE_USER)
+- bob / bob (ROLE_USER)