🚀 Major improvements: Fix short URLs, separate public/admin views, and enhance UX

✅ Fixed Critical Issues:
- Fixed dynamic QR code short URL redirect functionality
- Resolved data consistency issues with multiple LinkPageManager instances
- Fixed worker concurrency problems in Gunicorn configuration

🎨 UI/UX Enhancements:
- Separated public page from admin statistics view
- Created clean public_page.html for QR code users (no admin info)
- Added comprehensive statistics_page.html for admin analytics
- Enhanced dashboard with separate 'Manage' and 'Stats' buttons
- Improved navigation flow throughout the application

🔧 Technical Improvements:
- Added URLShortener instance reloading for data consistency
- Reduced Gunicorn workers to 1 to prevent file conflicts
- Increased timeout to 60s for better performance
- Enhanced debug logging for troubleshooting
- Added proper error handling and 404 responses

📁 New Files:
- app/templates/public_page.html - Clean public interface
- app/templates/statistics_page.html - Admin analytics dashboard

�� Modified Files:
- app/routes/main.py - Added /stats route, improved short URL handling
- app/templates/edit_links.html - Added Statistics button
- app/templates/index.html - Added Stats button for QR codes
- app/utils/link_manager.py - Enhanced data reloading
- app/utils/url_shortener.py - Added debug logging
- gunicorn.conf.py - Optimized worker configuration

This update provides a professional separation between public content and admin functionality while ensuring reliable short URL operation.

app/utils/url_shortener.py

@@ -57,11 +57,15 @@ class URLShortener:
     
     def create_short_url(self, original_url, custom_code=None, title=""):
         """Create a shortened URL"""
+        print(f"DEBUG: URLShortener.create_short_url called with url='{original_url}', custom_code='{custom_code}', title='{title}'")
+        
         # Generate or use custom short code
         if custom_code and custom_code not in self.short_urls_db:
             short_code = custom_code
+            print(f"DEBUG: Using custom short code: {short_code}")
         else:
             short_code = self.generate_short_code()
+            print(f"DEBUG: Generated short code: {short_code}")
         
         # Ensure original URL has protocol
         if not original_url.startswith(('http://', 'https://')):
@@ -78,11 +82,16 @@ class URLShortener:
             'last_accessed': None
         }
         
+        print(f"DEBUG: Adding to short_urls_db: {short_code} -> {url_data}")
         self.short_urls_db[short_code] = url_data
+        
+        print(f"DEBUG: Saving short URLs to file")
         self._save_short_urls()  # Persist to file
+        print(f"DEBUG: Short URLs saved successfully")
         
         # Return the complete short URL
         short_url = f"{self.base_domain}/s/{short_code}"
+        print(f"DEBUG: Returning short URL: {short_url}")
         return {
             'short_url': short_url,
             'short_code': short_code,