Rename '_Shared' directory to 'Shared' to improve project structure
Update layout and view location references accordingly
Clean up unnecessary files and standardize project organization
Introduces comprehensive user authentication flow with plan selection and registration
Includes:
- Pricing page with plan details and selection
- Payment page with plan summary and card information
- Signup page for different plan tiers
- Shared authentication layout and design system improvements
Enhances user onboarding experience with clear plan information and streamlined signup process
