Upgrade to @noble/curves ^2.0.1 and @noble/hashes ^2.0.1

This commit upgrades the noble cryptography dependencies to v2.0.1, which includes:

Breaking changes addressed:
- Updated all @noble imports to include .js extensions (required by v2 ESM-only API)
- Changed @noble/hashes/sha256 to @noble/hashes/sha2.js across 8 files
- Fixed secp256k1 API changes: methods now require Uint8Array instead of hex strings
- Updated schnorr.utils.randomPrivateKey() to schnorr.utils.randomSecretKey()

Files modified (27 total):
- package.json: Bump dependency versions
- Source files (12): pure.ts, nip04.ts, nip06.ts, nip13.ts, nip19.ts, nip44.ts,
  nip49.ts, nip77.ts, nip98.ts, nipb7.ts, utils.ts, wasm.ts
- Test files (14): All corresponding test files updated

Benefits:
- Latest security updates from audited noble libraries
- Smaller bundle sizes from v2 optimizations
- Future-proof ESM-only compatibility
- All tests passing

Co-authored-by: OpenCode <opencode@anomalyco.com>

pure.test.ts

@@ -11,7 +11,7 @@ import {
   generateSecretKey,
 } from './pure.ts'
 import { ShortTextNote } from './kinds.ts'
-import { bytesToHex, hexToBytes } from '@noble/hashes/utils'
+import { bytesToHex, hexToBytes } from '@noble/hashes/utils.js'
 
 test('private key generation', () => {
   expect(bytesToHex(generateSecretKey())).toMatch(/[a-f0-9]{64}/)