Add ILnBotClient interface and implement it

Introduce ILnBotClient to expose strongly-typed API resources (Wallets, Invoices, Payments, Addresses, Transactions, Webhooks, Keys, Events, Backup, Restore) and document DI registration. Update LnBotClient to implement ILnBotClient (replacing the direct IDisposable declaration) so consumers can depend on the interface.

Author: realbub

src/LnBot/ILnBotClient.cs

@@ -0,0 +1,39 @@
+using LnBot.Resources;
+
+namespace LnBot;
+
+/// <summary>
+/// Interface for the LnBot API client. Register in DI as a singleton or scoped service.
+/// </summary>
+public interface ILnBotClient : IDisposable
+{
+    /// <summary>Wallet management.</summary>
+    WalletsResource Wallets { get; }
+
+    /// <summary>Create and query invoices.</summary>
+    InvoicesResource Invoices { get; }
+
+    /// <summary>Send payments.</summary>
+    PaymentsResource Payments { get; }
+
+    /// <summary>Lightning address management.</summary>
+    AddressesResource Addresses { get; }
+
+    /// <summary>Transaction history.</summary>
+    TransactionsResource Transactions { get; }
+
+    /// <summary>Webhook endpoints.</summary>
+    WebhooksResource Webhooks { get; }
+
+    /// <summary>API key management.</summary>
+    KeysResource Keys { get; }
+
+    /// <summary>Real-time event stream.</summary>
+    EventsResource Events { get; }
+
+    /// <summary>Backup wallet access.</summary>
+    BackupResource Backup { get; }
+
+    /// <summary>Restore wallet access.</summary>
+    RestoreResource Restore { get; }
+}

src/LnBot/LnBotClient.cs

@@ -10,7 +10,7 @@ namespace LnBot;
 /// <summary>
 /// The official .NET client for the LnBot API.
 /// </summary>
-public sealed class LnBotClient : IDisposable
+public sealed class LnBotClient : ILnBotClient
 {
     internal const string Version = "0.4.0";
     internal static readonly string DefaultBaseUrl = "https://api.ln.bot";