packaging: pacman PKGBUILD + static toml++ + remote build script

- host-bin: install the `unbox` binary (install: true) so `meson install`
  (and the package) ship /usr/bin/unbox. Assets already install via the
  top-level install_subdir to /usr/share/unbox.
- ext-keybindings: force the toml++ subproject to default_library=static.
  Its wrapped meson.build hardcodes default_library=shared, which made the
  installed binary NEED libtomlplusplus.so.3 at runtime (only resolvable in
  the dev tree via LD_LIBRARY_PATH). Static-linking bakes it in.
- packaging/PKGBUILD: builds the working tree (reuses synced subprojects, no
  network), plain meson (no devtools needed), options=(!debug), and ALWAYS
  configures a fresh build dir — a reused/stale dir silently drops subproject
  option overrides (this is what reintroduced the shared-toml regression).
- packaging/start-unbox: dbus-run-session -- unbox (mirrors start-labwc.sh).
- packaging/build-remote.sh: rsync the tree to the fast box (builder),
  makepkg there, ferry the .pkg.tar.zst back, pacman -U here. Self-verifies
  the packaged + installed binary has no unresolved/shared-toml dependency
  (extracting to a real file — readelf can't read a non-seekable pipe).

Runtime NEEDED is now only system libs (wlroots-0.20, wayland, xkbcommon,
freetype, EGL, GLESv2, libstdc++/m/gcc_s/c) — installs + runs on the CF-AX3.

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