feat: complete TASK-WP4-04 color and dynamic stickers

apps/api/src/amap-adapter.ts

@@ -0,0 +1,15 @@
+export interface AmapAdapter {
+  reverseGeocode(coordinates: { latitude: number; longitude: number }): Promise<{ formattedValue: string; serviceMode: "mock" }>;
+}
+
+export class MockAmapAdapter implements AmapAdapter {
+  readonly calls: Array<{ latitude: number; longitude: number }> = [];
+
+  async reverseGeocode(coordinates: { latitude: number; longitude: number }) {
+    this.calls.push({ ...coordinates });
+    return {
+      formattedValue: `模拟地点 ${coordinates.latitude.toFixed(4)}, ${coordinates.longitude.toFixed(4)}`,
+      serviceMode: "mock" as const,
+    };
+  }
+}