fix(minimap): clarify dual filter API pattern in data source

Dual filter API methods (setInstanceSurfaceFilters and setInstanceSurfaceFilter) both exist for backward compatibility with different plugin implementations. Added comment explaining why both are checked in fallback pattern.

plugins/minimap/web/dataSources/SingleInstanceDataSource.ts

@@ -17,6 +17,8 @@ import type {
 } from "../minimap-data-source";
 
 interface MinimapWebPlugin {
+	// Dual filter API: plural version accepts array (flexible), singular version is a convenience wrapper.
+	// Both exist for backward compatibility with different plugin implementations (check plural first, then singular).
 	setInstanceSurfaceFilters?(filters: Array<{ instanceId: number; surface: string }> | null): Promise<void> | void;
 	setInstanceSurfaceFilter?(instanceId: number | null, surface: string | null): Promise<void> | void;
 	onTileUpdate(callback: (event: TileDataEvent) => void): void;