feat(lnbits): wrap the create_wallet RPC

The transport has exposed `create_wallet` (AUTH_ACCOUNT) since the RPC
registry was written, but LnbitsClient never wrapped it — the ATM only ever
needed the auto-created default wallet from `list_wallets`.

Add `createWallet(name)` plus its `CreatedWallet` reply type. Account-scoped,
so the envelope deliberately carries no `wallet_id`: that absence is what
makes the server resolve auth to the Account rather than a Wallet. Not
wrapped in `idempotent()` — a retry would mint a duplicate wallet, same
reasoning as create_invoice.

The reply carries the new wallet's adminkey/inkey, hence the type-level note
not to log it verbatim.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013A6683cCHnQxFUosx1krY4

packages/lnbits/src/client.ts

@@ -37,6 +37,7 @@ import type {
   CreateInvoiceBody,
   PayInvoiceBody,
   WalletInfo,
+  CreatedWallet,
   MachineConfigResponse,
   SubscribePaymentsBody,
   SubscribeAck,
@@ -211,6 +212,17 @@ export class LnbitsClient {
     return data ?? []
   }
 
+  /**
+   * Create an additional wallet on the calling account (`create_wallet`).
+   *
+   * Account-scoped (AUTH_ACCOUNT): the envelope carries no `wallet_id`, which
+   * is what makes the server resolve auth to the Account rather than a Wallet.
+   * NOT wrapped in `idempotent()` — a retry would mint a duplicate wallet.
+   */
+  async createWallet(name: string): Promise<CreatedWallet> {
+    return this.sendRpc<CreatedWallet>('create_wallet', { body: { name } })
+  }
+
   /** Pull server-delivered machine config (operator pubkey + fee config) over
    * the authenticated transport — spirekeeper's `get_machine_config` RPC
    * (bitspire#70 P1). Lets a seed-only ATM configure itself with no per-machine

packages/lnbits/src/index.ts

@@ -66,6 +66,7 @@ export type {
   CreateInvoiceBody,
   PayInvoiceBody,
   WalletInfo,
+  CreatedWallet,
   SubscribePaymentsBody,
   SubscribeAck,
   SubscribePush,

packages/lnbits/src/types.ts

@@ -112,6 +112,15 @@ export interface WalletInfo {
   balance: number
 }
 
+/** Reply shape of the `create_wallet` RPC — unlike WalletInfo it carries the
+ * fresh wallet's keys, so never log it verbatim. */
+export interface CreatedWallet {
+  id: string
+  name: string
+  adminkey: string
+  inkey: string
+}
+
 // ============================================================================
 // Subscriptions
 // ============================================================================