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>

nip49.ts

@@ -1,6 +1,6 @@
-import { scrypt } from '@noble/hashes/scrypt'
+import { scrypt } from '@noble/hashes/scrypt.js'
 import { xchacha20poly1305 } from '@noble/ciphers/chacha'
-import { concatBytes, randomBytes } from '@noble/hashes/utils'
+import { concatBytes, randomBytes } from '@noble/hashes/utils.js'
 import { Bech32MaxSize, Ncryptsec, encodeBytes } from './nip19.ts'
 import { bech32 } from '@scure/base'