feat(anaconda): integrate anaconda installer with openbox and add licensing documentation

Add Anaconda installer integration to FWS live environment:

- Implement Anaconda launcher in .xinitrc with comprehensive error logging and debugging support
- Add anaconda and anaconda-widgets packages to baseline and releng ISO configs
- Fix anaconda-widgets PKGBUILD: replace gladeui with glib2-devel, disable Glade module
- Update anaconda PKGBUILD with improved dependencies and build configuration
- Add python-blivet PKGBUILD with detailed dependency documentation

Enhance documentation and branding:

- Expand AUTHORS.rst to clarify FWS vs archiso authorship and licensing
- Update CONTRIBUTING.rst with inbound=outbound licensing policy and DCO requirements
- Extend README.md with comprehensive legal basis table and licensing checklist
- Remove Arch Linux references from MOTD and update to FWS GitHub project page
- Fix fastfetch.sh to avoid read-only variable conflict in zsh
- Add xterm to packages for installer debugging

All changes maintain GPL-3.0-or-later compliance and improve GPL offer transparency.

configs/releng/airootfs/etc/motd

@@ -1,11 +1,8 @@
-To install FWS follow the installation guide:
-https://wiki.archlinux.org/title/Installation_guide
+Welcome to FWS live media.
+
+To install FWS, see the project page:
+https://github.com/You-re-like-Windows-a-bitch/fws
 
 For Wi-Fi, authenticate to the wireless network using the iwctl utility.
 For mobile broadband (WWAN) modems, connect with the mmcli utility.
 Ethernet, WLAN and WWAN interfaces using DHCP should work automatically.
-
-After connecting to the internet, the installation guide can be accessed
-via the convenience script Installation_guide.
-
-                                          

configs/releng/airootfs/etc/profile.d/fastfetch.sh

@@ -1,5 +1,9 @@
 #!/usr/bin/env bash
-status=$?
-if [ "${status}" -eq 0 ]; then
+# NB : ce fichier est SOURCÉ par le shell de login (zsh sur le live), pas exécuté
+# → le shebang est ignoré. En zsh « status » est une variable spéciale EN LECTURE
+# SEULE (alias de $?) : s'y affecter casse (« read-only variable: status »).
+# On utilise donc un autre nom.
+_fastfetch_rc=$?
+if [ "${_fastfetch_rc}" -eq 0 ]; then
     fastfetch
 fi

configs/releng/packages.x86_64

@@ -100,3 +100,8 @@ open-vm-tools
 
 # --- FWS (fws-local) ---
 winboat-bin
+
+# --- Installateur Anaconda (fws-local) ---
+# 'anaconda' tire automatiquement anaconda-widgets + toutes ses dépendances
+# (python-blivet, pykickstart, libreport, gtk3, NetworkManager…).
+anaconda