Updated Makefile, mobile.mk, and melos.yaml to centralize mobile app build, start, and code generation commands using Melos scripts. Added info and install-melos commands for easier onboarding and workspace setup. Documentation updated to reflect staff app naming and new command structure.
Relocated all app directories (client, design_system_viewer, staff) and their contents under the new 'apps/mobile' path. This change improves project organization and prepares for future platform-specific structuring.
