feat: add jsn scope create to bootstrap scoped applications via CLI

[jacebenson]

Closes #31

Changes

• Add CreateApplication SDK method (sys_app)
• Add GetProperty helper to fetch sys_properties (used for glide.appcreator.company.code)
• Add jsn scope create command with auto-generated scope prefix from instance vendor code
• Supports --name, --scope/--prefix, --description, --version, --set-current, --global
• Update command catalog to list create action for scope

Usage

# Auto-generate scope from vendor code
jsn scope create --name "My App"

# Explicit scope
jsn scope create --name "My App" --scope x_1234_myapp

# Global application
jsn scope create --name "My Global App" --global