Initial commit — TANINUX (camel): management app + distro packaging

- app: GTK System Settings (tsettings) + Software Hub (thub) + TUI
- distro/: camel.toml manifest + MANIFEST.md (Arch + [tanin] repo model)
- packaging/: taninux, tanin-desktop (niri metapackage), tanin-greet,
  tanin-libadwaita, tanin-setup
- docs/, data/, LICENSE (GPL-3.0-or-later)

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

packaging/tanin-greet/install-local.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+# Install tanin-greet as the greetd greeter on THIS machine. Run with sudo:
+#   sudo bash packaging/tanin-greet/install-local.sh
+# Reversible: the current greetd config is backed up first.
+set -euo pipefail
+SRC="$(cd "$(dirname "$0")" && pwd)"
+ts="$(date +%Y%m%d-%H%M%S)"
+
+# 1) greeter binary + stylesheet
+install -Dm755 "$SRC/tanin-greet"     /usr/bin/tanin-greet
+install -Dm644 "$SRC/tanin-greet.css" /etc/greetd/tanin-greet.css
+
+# 2) optional login wallpaper (greeter falls back to a dark scrim if absent)
+if [ -f "${TANIN_LOGIN_BG:-}" ]; then
+  install -Dm644 "$TANIN_LOGIN_BG" /usr/share/backgrounds/tanin/login.jpg
+fi
+
+# 3) point greetd at tanin-greet (back up the working config first)
+[ -f /etc/greetd/config.toml ] && cp -a /etc/greetd/config.toml "/etc/greetd/config.toml.bak-$ts"
+install -Dm644 "$SRC/config.toml" /etc/greetd/config.toml
+
+cat <<EOF
+tanin-greet installed.
+  greeter:  /usr/bin/tanin-greet
+  css:      /etc/greetd/tanin-greet.css
+  greetd:   /etc/greetd/config.toml  ->  cage -s -- tanin-greet
+  backup:   /etc/greetd/config.toml.bak-$ts
+
+greetd is already enabled — it shows on the NEXT login. To see it now: log out
+(or 'sudo systemctl restart greetd' from a TTY — Ctrl+Alt+F2).
+If anything is wrong, switch to a TTY and revert:
+  sudo cp /etc/greetd/config.toml.bak-$ts /etc/greetd/config.toml
+EOF