Pre-0.1 cleanup: fmt, docs, licenses, AUR-ready packaging

- cargo fmt across the workspace (the CI gate the last push tripped).
- varde-daemon: drop the now-unused bytes dependency.
- varde-ctl(1): document push; gc reflects the continuous-sweep
  reality; subscribe mentions push events.
- config.toml example: gc_interval_secs, and an honest note that
  max_download_bytes_per_sec is currently unenforced.
- LICENSE-MIT + LICENSE-APACHE at the root (the declared license now
  ships as files), bundled into release tarballs and installed by the
  PKGBUILD.
- PKGBUILD: real maintainer, AUR pre-flight note (updpkgsums), license
  installation.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

varde-daemon/Cargo.toml

@@ -22,7 +22,6 @@ iroh-mdns-address-lookup = "0.4"
 # dependency tree via iroh-blobs.
 n0-future = "0.1"
 irpc = "0.17"
-bytes = "1"
 # Feature-gated D-Bus client for NetworkManager metered status.
 zbus = { version = "5", optional = true, default-features = false, features = ["tokio"] }
 # Announcement signatures use iroh's own key types; postcard is the