refactor: pynostr instead of custom nostr lib

crud.py

@@ -2,9 +2,9 @@
 
 from lnbits.db import Database
 from lnbits.helpers import urlsafe_short_hash
+from pynostr.key import PrivateKey
 
 from .models import CreatePayLinkData, LnurlpSettings, PayLink
-from .nostr.key import PrivateKey
 
 db = Database("ext_lnurlp")
 

helpers.py

@@ -1,7 +1,6 @@
 from fastapi import Request
 from lnurl import encode as lnurl_encode
-
-from .nostr.key import PrivateKey
+from pynostr.key import PrivateKey
 
 
 def parse_nostr_private_key(key: str) -> PrivateKey:

models.py

@@ -2,9 +2,9 @@
 
 from fastapi import Query
 from pydantic import BaseModel, Field
+from pynostr.key import PrivateKey
 
 from .helpers import parse_nostr_private_key
-from .nostr.key import PrivateKey
 
 
 class LnurlpSettings(BaseModel):