chore(nostr-client): move dev scripts to dev/ folder

Move 9 development/testing .mjs scripts out of the package root into
dev/ to keep the published package clean. Update relative imports
and dev.sh reference.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/nostr-client/dev/generate-ndebit.mjs

@@ -0,0 +1,84 @@
+/**
+ * Generate an ndebit string for ShockWallet to scan
+ *
+ * Usage: node generate-ndebit.mjs [pointer]
+ *
+ * The ndebit allows ShockWallet to send an invoice that Lightning.Pub will pay.
+ * This is the LNURL-withdraw equivalent for CLINK.
+ */
+
+import { bech32 } from '@scure/base'
+
+const LIGHTNING_PUB_PUBKEY =
+  process.env.LIGHTNING_PUB_PUBKEY ||
+  '4a72e400a254bf74a70cc711ab97e461b8d4fd9738b1ac3b5194cdeb3192ab91'
+const RELAY_URL = process.env.NOSTR_RELAY_URL || 'wss://strfry.shock.network'
+const POINTER = process.argv[2] || 'atm-cashin-' + Date.now()
+
+function hexToBytes(hex) {
+  const bytes = new Uint8Array(hex.length / 2)
+  for (let i = 0; i < hex.length; i += 2) {
+    bytes[i / 2] = parseInt(hex.slice(i, i + 2), 16)
+  }
+  return bytes
+}
+
+function encodeTLV(tlv) {
+  const entries = []
+  Object.entries(tlv)
+    .reverse()
+    .forEach(([t, vs]) => {
+      vs.forEach((v) => {
+        const entry = new Uint8Array(v.length + 2)
+        entry.set([parseInt(t)], 0)
+        entry.set([v.length], 1)
+        entry.set(v, 2)
+        entries.push(entry)
+      })
+    })
+
+  // Concatenate all entries
+  const totalLength = entries.reduce((sum, e) => sum + e.length, 0)
+  const result = new Uint8Array(totalLength)
+  let offset = 0
+  for (const entry of entries) {
+    result.set(entry, offset)
+    offset += entry.length
+  }
+  return result
+}
+
+function ndebitEncode(debit) {
+  const encoder = new TextEncoder()
+
+  const tlv = {
+    0: [hexToBytes(debit.pubkey)],
+    1: [encoder.encode(debit.relay)],
+  }
+
+  if (debit.pointer) {
+    tlv[2] = [encoder.encode(debit.pointer)]
+  }
+
+  const data = encodeTLV(tlv)
+  const words = bech32.toWords(data)
+  return bech32.encode('ndebit', words, 5000)
+}
+
+// Generate ndebit
+const ndebit = ndebitEncode({
+  pubkey: LIGHTNING_PUB_PUBKEY,
+  relay: RELAY_URL,
+  pointer: POINTER,
+})
+
+console.log('=== NDEBIT for ShockWallet ===')
+console.log('')
+console.log('Pubkey:', LIGHTNING_PUB_PUBKEY)
+console.log('Relay:', RELAY_URL)
+console.log('Pointer:', POINTER)
+console.log('')
+console.log('ndebit string:')
+console.log(ndebit)
+console.log('')
+console.log('ShockWallet should scan this QR code to receive sats from the ATM.')