Add POIs request

ors-client/src/main/java/org/nitri/ors/model/pois/PoisRequest.kt

@@ -0,0 +1,25 @@
+package org.nitri.ors.model.pois
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class PoisRequest(
+    val request: String = "pois",
+    val geometry: Geometry,
+    val filters: Map<String, String>? = null,
+    val limit: Int? = null,
+    val sortby: String? = null
+)
+
+@Serializable
+data class Geometry(
+    val bbox: List<List<Double>>? = null,        // [[minLon,minLat],[maxLon,maxLat]]
+    val geojson: GeoJsonGeometry? = null,        // optional: GeoJSON geometry
+    val buffer: Int? = null                      // optional: buffer in meters
+)
+
+@Serializable
+data class GeoJsonGeometry(
+    val type: String,                            // e.g., "Point"
+    val coordinates: List<Double>                // [lon, lat]
+)