Initial commit: Luftglanz drone website with integrated AI chat assistant

Features:
- Complete Luftglanz drone cleaning website
- AI chat assistant integrated with OpenAI API
- Expert product advice for AGO Quart and Mellerud cleaning products
- Formal German language support (Sie form)
- Secure PHP backend for API calls
- Responsive design with mobile support
- Product-specific knowledge base
- Safety statements from manufacturers
- Multi-page integration (index, products, services, contact)

Technical components:
- AI chat widget (js/ai-chat.js)
- Chat styling (css/components/ai-chat.css)
- Backend API (ai-chat-api.php)
- Product knowledge base with detailed specifications
- Demo and documentation files

js/mobile-menu.js

@@ -0,0 +1,45 @@
+/**
+ * Mobile navigation functionality
+ * This script handles the mobile hamburger menu behavior
+ */
+
+document.addEventListener('DOMContentLoaded', function() {
+    // Mobile navigation toggle
+    const mobileToggle = document.getElementById('mobileToggle');
+    const mainNav = document.getElementById('mainNav');
+    
+    if(mobileToggle && mainNav) {
+        mobileToggle.addEventListener('click', function() {
+            mainNav.classList.toggle('active');
+        });
+    }
+    
+    // Close mobile menu when a link is clicked
+    const mobileNavLinks = document.querySelectorAll('.main-nav a');
+    mobileNavLinks.forEach(link => {
+        link.addEventListener('click', function() {
+            if (window.innerWidth <= 768) {
+                mainNav.classList.remove('active');
+            }
+        });
+    });
+
+    // Close menu when clicking outside
+    document.addEventListener('click', function(event) {
+        if (window.innerWidth <= 768 && 
+            !event.target.closest('.main-nav') && 
+            !event.target.closest('.mobile-toggle') && 
+            mainNav.classList.contains('active')) {
+            mainNav.classList.remove('active');
+        }
+    });
+
+    // Ensure copyright year is 2025 on mobile
+    const footerText = document.querySelector('footer p[data-i18n="footer_text"]');
+    if (footerText) {
+        // Force update the copyright year to 2025 for mobile and desktop
+        const currentText = footerText.innerHTML;
+        const updatedText = currentText.replace(/© \d{4}/, '© 2025');
+        footerText.innerHTML = updatedText;
+    }
+});