I need a complete Android-based billing application purpose-built for my restaurant operations. The app must handle table management, live inventory tracking, and basic customer management in one streamlined flow so my staff can take orders, close bills, and see stock levels without juggling separate tools. At checkout, the system has to accept credit/debit cards, mobile wallet payments, and cash, letting me split or combine payment types on the same bill. When the day ends, I want to tap once and receive three clear reports: a daily sales summary, an updated inventory report, and a customer-preference breakdown to show top-selling items and repeat-visit patterns. Please deliver a clean, touch-friendly interface that runs smoothly on standard Android tablets and phones. I’ll need the installable APK for immediate use plus full source code so future tweaks remain in my control. If you have experience integrating receipt printers or exporting reports to PDF/Excel, let me know—that would be an added bonus but not mandatory for the first release.