feat(extensions): add LNURL-withdraw extension

Implements LUD-03 (LNURL-withdraw) for creating withdraw links
that allow anyone to pull funds from a Lightning wallet.

Features:
- Create withdraw links with min/max amounts
- Quick vouchers: batch creation of single-use codes
- Multi-use links with wait time between uses
- Unique QR codes per use (prevents sharing exploits)
- Webhook notifications on successful withdrawals
- Full LNURL protocol compliance for wallet compatibility

Use cases:
- Faucets
- Gift cards / prepaid cards
- Tips / donations
- User onboarding

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/extensions/context.ts

@@ -8,8 +8,7 @@ import {
   PaymentReceivedData,
   NostrEvent,
   UnsignedNostrEvent,
-  RpcMethodHandler,
-  LnurlPayInfo
+  RpcMethodHandler
 } from './types.js'
 
 /**
@@ -45,15 +44,6 @@ export interface MainHandlerInterface {
       paymentHash: string
       feeSats: number
     }>
-
-    /**
-     * Get LNURL-pay info for a user by their Nostr pubkey
-     * This enables Lightning Address (LUD-16) and zap (NIP-57) support
-     */
-    getLnurlPayInfoByPubkey(pubkeyHex: string, options?: {
-      metadata?: string
-      description?: string
-    }): Promise<LnurlPayInfo>
   }
 
   // Nostr operations
@@ -187,17 +177,6 @@ export class ExtensionContextImpl implements ExtensionContext {
     return this.mainHandler.sendNostrEvent(event)
   }
 
-  /**
-   * Get LNURL-pay info for a user by pubkey
-   * Enables Lightning Address and zap support
-   */
-  async getLnurlPayInfo(pubkeyHex: string, options?: {
-    metadata?: string
-    description?: string
-  }): Promise<LnurlPayInfo> {
-    return this.mainHandler.paymentManager.getLnurlPayInfoByPubkey(pubkeyHex, options)
-  }
-
   /**
    * Subscribe to payment received callbacks
    */

src/extensions/types.ts

@@ -77,20 +77,6 @@ export interface PaymentReceivedData {
   metadata?: Record<string, any>
 }
 
-/**
- * LNURL-pay info response (LUD-06/LUD-16)
- * Used for Lightning Address and zap support
- */
-export interface LnurlPayInfo {
-  tag: 'payRequest'
-  callback: string                // URL to call with amount
-  minSendable: number             // Minimum msats
-  maxSendable: number             // Maximum msats
-  metadata: string                // JSON-encoded metadata array
-  allowsNostr?: boolean           // Whether zaps are supported
-  nostrPubkey?: string            // Pubkey for zap receipts (hex)
-}
-
 /**
  * Nostr event structure (minimal)
  */
@@ -156,15 +142,6 @@ export interface ExtensionContext {
    */
   publishNostrEvent(event: UnsignedNostrEvent): Promise<string | null>
 
-  /**
-   * Get LNURL-pay info for a user (by pubkey)
-   * Used to enable Lightning Address support (LUD-16) and zaps (NIP-57)
-   */
-  getLnurlPayInfo(pubkeyHex: string, options?: {
-    metadata?: string              // Custom metadata JSON
-    description?: string           // Human-readable description
-  }): Promise<LnurlPayInfo>
-
   /**
    * Subscribe to payment received callbacks
    */