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>

dist/config.toml

@@ -16,9 +16,15 @@
 # Upload cap in bytes/sec. 0 disables serving entirely.
 #max_upload_bytes_per_sec = 10485760   # 10 MiB/s
 
-# Download cap in bytes/sec. 0 means unlimited.
+# Download cap in bytes/sec. 0 means unlimited. Currently not
+# enforced: the cap rode a seam the iroh-blobs 0.103 downloader does
+# not expose yet.
 #max_download_bytes_per_sec = 0
 
+# Interval of the store's built-in garbage collector, in seconds.
+# Unpinned blobs are swept by this loop; there is no on-demand gc.
+#gc_interval_secs = 300
+
 # LAN peer discovery (mDNS). Discovery is the open tier: being visible
 # costs nothing; serving is still gated on trust and per-pin policy.
 #discovery = true