feat: v1.1.0 - Docker, i18n, setup wizard, rate limiting, OpenAPI

New features:
- Docker support (Dockerfile + docker-compose.yml)
- GitHub Actions CI pipeline (PHP lint, JS lint, Docker build, i18n validation)
- Internationalization system with 3 languages (it, en, de) and 347 translation keys
- First-run setup wizard (4-step configuration)
- File-based API rate limiting (120/15/5 req/min tiers)
- OpenAPI 3.1.0 specification for all 43 API endpoints
- CONTRIBUTING.md with translation and development guide
- Screenshots directory placeholder

Modified:
- README.md: Docker badges, install instructions, translations section
- api/index.php: rate limiting middleware
- assets/js/app.js: i18n system, setup wizard, t() function
- assets/css/style.css: setup wizard styles
- index.html: data-i18n attributes, setup wizard overlay, language settings
- .gitignore: rate_limits exclusion

docker-compose.yml

@@ -0,0 +1,18 @@
+services:
+  dispensa:
+    build: .
+    container_name: dispensa
+    ports:
+      - "8080:80"
+    volumes:
+      # Persist database and runtime data
+      - dispensa_data:/var/www/html/data
+      # Mount your local .env configuration
+      - ./.env:/var/www/html/.env:ro
+    restart: unless-stopped
+    environment:
+      - TZ=Europe/Rome
+
+volumes:
+  dispensa_data:
+    driver: local