Switch to instance, stub out relay methods

go.sum

@@ -1,5 +1,5 @@
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-fiatjaf.com/nostr v0.0.0-20250923223459-3c540e726e17/go.mod h1:Nq86Jjsd0OmsOEImUg0iCcLuqM5B67Nj2eu/2dP74Ss=
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@@ -26,6 +26,8 @@ github.com/decred/dcrd/dcrec/secp256k1/v4 v4.4.0/go.mod h1:ZXNYxsqcloTdSy/rNShjY
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@@ -33,6 +35,12 @@ github.com/json-iterator/go v1.1.12 h1:PV8peI4a0ysnczrg+LtxykD8LfKY9ML6u2jnxaEnr
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@@ -40,14 +48,20 @@ github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
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@@ -70,7 +84,11 @@ golang.org/x/exp v0.0.0-20250305212735-054e65f0b394 h1:nDVHiLt8aIbd/VzvPWN6kSOPE
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