I need an initial web-based pharmacy inventory tool that covers three essentials: tracking current stock levels, generating straightforward sales reports, and keeping a manageable supplier list. The system should recognise three user roles—Pharmacist, Store Manager, and Sales Representative—each seeing only the screens relevant to their day-to-day tasks. Scope for this first build is intentionally lean: • Simple dashboard that shows low-stock alerts at a glance. • CRUD pages for medicines, suppliers, and sales entries. • A downloadable CSV or PDF sales summary filtered by date range. • Role-based login with basic access control. A clean, responsive interface is enough; no need for elaborate UI polish at this stage. Code can be PHP, Node, Python, or any other common stack—just keep it well-commented so I can extend it later. Please outline your proposed tech stack, estimated timeline, and any similar work you have done when you respond.