1xBet Apple-of-Fortune Logic

I need a self-contained Apple of Fortune game core identical to the one on 1xBet, but written so it can drop straight into a mobile app. Graphics, animations, and UI will be handled separately; what I’m after is the underlying engine that powers every round.

Here’s what I expect the module to cover:
• Full round-flow control – bet input, grid generation, progressive reveal of apples/bombs, win evaluation, and payout calculation exactly as in the original game.
• Configurable house-edge variables so I can tune return-to-player without touching core code.
• Clean APIs (startGame, makeMove, getState, cashOut) that a React Native, Flutter, or native front-end can call asynchronously.
• Secure randomness with a provably-fair seed scheme; results must be reproducible for verification.
• Thorough in-code comments plus a brief README walking through build steps and API usage.
• Unit tests showing correct behaviour for edge cases and typical player sessions.

I’m happy to let you pick the language as long as it compiles or transpiles neatly into Android and iOS builds and keeps performance tight on mid-range devices.

Send over a quick outline of your proposed tech stack, your experience with game math or betting-style titles, and an estimated turnaround time.