feat: initialize mini program map engine

miniprogram/engine/layer/mapLayer.ts

@@ -0,0 +1,15 @@
+import { type CameraState } from '../camera/camera'
+import { type MapScene } from '../renderer/mapRenderer'
+import { type TileStore } from '../tile/tileStore'
+
+export interface LayerRenderContext {
+  ctx: any
+  camera: CameraState
+  scene: MapScene
+  pulseFrame: number
+  tileStore: TileStore
+}
+
+export interface MapLayer {
+  draw(context: LayerRenderContext): void
+}