Remove all schollz/* dependencies: fork pake, replicate logger and CLI

- src/pake: trimmed fork of schollz/pake/v3, P256-only (stdlib
  crypto/elliptic), dropping the tscholl2/siec and filippo.io/edwards25519
  transitive deps along with it.
- src/logger: minimal in-repo replacement for schollz/logger with the
  same leveled-logging call surface.
- src/cli: replaced schollz/cli (urfave/cli fork) with a small
  flag-package-based parser for the send/relay/receive commands actually
  in use; subcommand keyword can appear before or after its flags.
- Dropped schollz/progressbar entirely (its show-progress code paths were
  already unreachable dead code since no CLI flag wired them up).

go.mod/go.sum no longer reference any schollz/* module.

go.mod

@@ -7,23 +7,11 @@ require (
 	github.com/kalafut/imohash v1.1.1
 	github.com/magisterquis/connectproxy v0.0.0-20200725203833-3582e84f0c9b
 	github.com/minio/highwayhash v1.0.4
-	github.com/schollz/cli/v2 v2.2.1
-	github.com/schollz/logger v1.2.0
-	github.com/schollz/pake/v3 v3.1.1
-	github.com/schollz/progressbar/v3 v3.19.1
 	golang.org/x/crypto v0.53.0
 	golang.org/x/net v0.56.0
 )
 
 require (
-	filippo.io/edwards25519 v1.2.0 // indirect
-	github.com/cpuguy83/go-md2man/v2 v2.0.7 // indirect
-	github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db // indirect
-	github.com/rivo/uniseg v0.4.7 // indirect
-	github.com/russross/blackfriday/v2 v2.1.0 // indirect
-	github.com/stretchr/testify v1.11.1 // indirect
-	github.com/tscholl2/siec v0.0.0-20240310163802-c2c6f6198406 // indirect
 	github.com/twmb/murmur3 v1.1.8 // indirect
 	golang.org/x/sys v0.46.0 // indirect
-	golang.org/x/term v0.44.0 // indirect
 )