gitignore: cover the key files the node actually writes (#43)

.gitignore ignores *.dat and wallet.dat, but the node also writes three files
in its data directory that are not .dat and are just as sensitive:

  btf_enc.key      this node's .btf service key -- its network identity
  nostr.key        the Nostr key its descriptors are signed with
  walletrpc.token  bearer token authorising spends over the wallet API

A node run with its data directory inside a working tree -- which is the
obvious thing to do while developing -- leaves all three untracked but
committable, and `git add -A` takes them. Losing btf_enc.key means losing your
address; publishing walletrpc.token hands over the wallet to anyone who can
reach the port.

Also ignore key backup archives and stray .patch/.rej/.orig files.

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

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