🚀 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/link_manager.py

@@ -69,7 +69,16 @@ class LinkPageManager:
 
     def add_link(self, page_id, title, url, description="", enable_shortener=False, custom_short_code=None):
         """Add a link to a page with optional URL shortening"""
+        print(f"DEBUG: LinkManager.add_link called for page {page_id}")
+        print(f"DEBUG: Current pages in memory: {list(self.link_pages_db.keys())}")
+        
         if page_id not in self.link_pages_db:
+            print(f"DEBUG: Page {page_id} not found in memory, reloading from file")
+            self.link_pages_db = self._load_link_pages()
+            print(f"DEBUG: After reload, pages: {list(self.link_pages_db.keys())}")
+            
+        if page_id not in self.link_pages_db:
+            print(f"DEBUG: Page {page_id} still not found after reload")
             return False
         
         # Ensure URL has protocol
@@ -90,21 +99,27 @@ class LinkPageManager:
         
         # Generate short URL if enabled
         if enable_shortener:
+            print(f"DEBUG: Creating short URL for {url}")
             try:
                 short_result = self.url_shortener.create_short_url(
                     url, 
                     custom_code=custom_short_code,
                     title=title
                 )
+                print(f"DEBUG: Short URL created: {short_result}")
                 link_data['short_url'] = short_result['short_url']
                 link_data['short_code'] = short_result['short_code']
             except Exception as e:
                 # If shortening fails, continue without it
-                print(f"URL shortening failed: {e}")
+                print(f"DEBUG: URL shortening failed: {e}")
         
+        print(f"DEBUG: Adding link to page data: {link_data}")
         self.link_pages_db[page_id]['links'].append(link_data)
         self.link_pages_db[page_id]['updated_at'] = datetime.now().isoformat()
+        
+        print(f"DEBUG: Saving link pages to file")
         self._save_link_pages()  # Persist to file
+        print(f"DEBUG: Link added successfully")
         return True
     
     def update_link(self, page_id, link_id, title=None, url=None, description=None, enable_shortener=None, custom_short_code=None):
@@ -196,4 +211,6 @@ class LinkPageManager:
     
     def resolve_short_url(self, short_code):
         """Resolve a short URL to its original URL"""
+        # Reload URLShortener data to ensure we have the latest URLs
+        self.url_shortener = URLShortener()
         return self.url_shortener.get_original_url(short_code)