Add [tanin] repo build script; build 5 own packages + DB

- packaging/build-tanin-repo.sh: builds own pkgs + repo-add DB (-> ~/projects/tanin-repo)
- built: tanin-greet, tanin-libadwaita, tanin-setup, tanin-eww, tanin-desktop
- manifest: cliphist + cage are in extra (not AUR rebuilds); only eww/tiramisu/
  waypaper need rebuilding into [tanin]; record repo-build status

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

packaging/tanin-desktop/pkg/tanin-desktop/.PKGINFO

@@ -0,0 +1,55 @@
+# Generated by makepkg 7.1.0
+# using fakeroot version 1.37.2
+pkgname = tanin-desktop
+pkgbase = tanin-desktop
+xdata = pkgtype=pkg
+pkgver = 0.2.0-1
+pkgdesc = TANINUX desktop — metapackage pulling the full niri/eww environment
+url = https://taninux.kgva.ch
+builddate = 1781813721
+packager = Unknown Packager
+size = 0
+arch = any
+license = GPL-3.0-or-later
+depend = taninux
+depend = tanin-greet
+depend = tanin-libadwaita
+depend = tanin-eww
+depend = tanin-setup
+depend = niri
+depend = greetd
+depend = cage
+depend = xdg-desktop-portal
+depend = xdg-desktop-portal-gtk
+depend = xdg-desktop-portal-gnome
+depend = eww
+depend = tiramisu
+depend = waypaper
+depend = cliphist
+depend = foot
+depend = jq
+depend = wl-clipboard
+depend = xdg-utils
+depend = libqalculate
+depend = grim
+depend = slurp
+depend = networkmanager
+depend = bluez
+depend = bluez-utils
+depend = pipewire
+depend = pipewire-pulse
+depend = wireplumber
+depend = brightnessctl
+depend = playerctl
+depend = flatpak
+depend = pacman-contrib
+depend = adw-gtk3
+depend = adwaita-icon-theme
+depend = papirus-icon-theme
+depend = inter-font
+depend = ttf-iosevka-nerd
+optdepend = paru: AUR support in the Software Hub (opt-in)
+optdepend = wlsunset: night light
+optdepend = cups: printer management
+optdepend = timeshift: system snapshots/backups
+optdepend = waybar: fallback bar if eww is missing (launch.sh falls back to it)