Set up multiplatform structure

composeApp/src/androidMain/kotlin/ru/fromchat/api/AndroidKtorLogger.kt

@@ -0,0 +1,16 @@
+package ru.fromchat.api
+
+import android.util.Log
+import io.ktor.client.plugins.logging.Logger
+
+/**
+ * Custom Android logger for Ktor that uses Android's Log system
+ */
+object AndroidKtorLogger : Logger {
+    private const val TAG = "Ktor"
+    
+    override fun log(message: String) {
+        Log.d(TAG, message)
+    }
+}
+

composeApp/src/androidMain/kotlin/ru/fromchat/api/ApiClient.android.kt

@@ -0,0 +1,13 @@
+package ru.fromchat.api
+
+import io.ktor.client.HttpClient
+import io.ktor.client.HttpClientConfig
+import io.ktor.client.engine.okhttp.OkHttp
+import io.ktor.client.engine.okhttp.OkHttpConfig
+
+actual fun createPlatformHttpClient(
+    block: HttpClientConfig<*>.() -> Unit
+): HttpClient {
+    @Suppress("UNCHECKED_CAST")
+    return HttpClient(OkHttp, block as HttpClientConfig<OkHttpConfig>.() -> Unit)
+}