feat: implement Bold & Strong IDP favicon

- Replace default favicon with Bold & Strong IDP design
- Background: #005a9f (darker blue) for better contrast
- Text: Bold white 'IDP' letters clearly visible
- Generated all required sizes: 16x16, 32x32, 180x180, 192x192, 512x512
- Includes .ico format for maximum browser compatibility
- Professional branding for GenAI Intelligent Document Processing
- High readability at small favicon sizes

Author: EC2 Default User