feat: add maxLevel to GameOptions with default of 25

- New option: maxLevel (defaults to 25)
- Once a player reaches maxLevel, levels no longer progress
- Prevents unlimited level scaling and FPS increases
- Example: useGame({ maxLevel: 10 })

src/types.ts

@@ -34,6 +34,7 @@ export type GameOptions = {
   timeLimit?: number;
   startingLevel?: number;
   foodsPerLevel?: number;
+  maxLevel?: number;
 };
 
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