feat: add Nostr application#1
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Implements the Nostr application from BIP85 v2.1.0:
- `Bip85Entropy.deriveNostr({xprvBase58, identity, accountIndex})` derives
`m/83696968'/9000'/{identity}'/{accountIndex}'` and returns the 32-byte
key as a NIP19 Bech32 `nsec` string
- `Bip85Entropy.nsecEncode(Uint8List)` is exposed for callers that already
hold a raw 32-byte secret key
- `NostrApplication` (number 9000) is registered and routed through
`deriveFromRawPath` and `deriveFromHardenedPath`
Bech32 (not Bech32m) per NIP19. A minimal encode-only Bech32 routine is
included to keep the package self-contained (the published `bech32` Dart
package caps SDK at <3.0.0, incompatible with this package's ^3.7.0).
Tests cover the three BIP85 spec vectors, path-routing (full path,
partial path, hardened path), application-registry resolution,
`nsecEncode` validation, boundary inputs (reserved zero, max hardened
0x7FFFFFFF) and `nsec` output format (length 63, `nsec1` prefix).
Bumps to 1.1.0; CHANGELOG, README and example updated.
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bitcoin/bips#2126