refactor: code smell runBlocking inside an OkHttp Interceptor

app/src/main/java/com/bitcointxoko/gudariwallet/api/LNbitsHttpClient.kt

@@ -0,0 +1,17 @@
+package com.bitcointxoko.gudariwallet.api
+
+import com.bitcointxoko.gudariwallet.util.WalletConstants
+import okhttp3.OkHttpClient
+import java.util.concurrent.TimeUnit
+
+/**
+ * Single shared OkHttpClient for the entire app.
+ * Used by both LNbitsClient (Retrofit) and WalletNotificationService (WebSocket).
+ */
+object LNbitsHttpClient {
+    val instance: OkHttpClient = OkHttpClient.Builder()
+        .connectTimeout(WalletConstants.CONNECT_TIMEOUT_S, TimeUnit.SECONDS)
+        .readTimeout(WalletConstants.READ_TIMEOUT_S, TimeUnit.SECONDS)
+        .writeTimeout(WalletConstants.WRITE_TIMEOUT_S, TimeUnit.SECONDS)
+        .build()
+}