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

Dockerfile

@@ -0,0 +1,41 @@
+FROM php:8.2-apache
+
+# Install required PHP extensions
+RUN apt-get update && apt-get install -y \
+    libsqlite3-dev \
+    libcurl4-openssl-dev \
+    && docker-php-ext-install pdo_sqlite curl mbstring \
+    && apt-get clean && rm -rf /var/lib/apt/lists/*
+
+# Enable Apache mod_rewrite
+RUN a2enmod rewrite
+
+# Set working directory
+WORKDIR /var/www/html
+
+# Copy application files
+COPY . /var/www/html/
+
+# Create data directory with proper permissions
+RUN mkdir -p /var/www/html/data/backups \
+    && chown -R www-data:www-data /var/www/html/data \
+    && chmod -R 775 /var/www/html/data
+
+# Create .env from example if it doesn't exist (will be overridden by volume mount)
+RUN [ ! -f /var/www/html/.env ] && cp /var/www/html/.env.example /var/www/html/.env || true
+
+# Apache configuration: serve from app root
+RUN echo '<Directory /var/www/html>\n\
+    AllowOverride All\n\
+    Require all granted\n\
+</Directory>' > /etc/apache2/conf-available/dispensa.conf \
+    && a2enconf dispensa
+
+# Expose port 80
+EXPOSE 80
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=5s --retries=3 \
+    CMD curl -f http://localhost/ || exit 1
+
+CMD ["apache2-foreground"]