chore: migrate from calamares to anaconda installer

Remove Calamares compilation and configuration, replace with Anaconda installer setup.

Changes:
- Remove Calamares-related entries from .gitignore
- Update README with migration status from Calamares to Anaconda
- Rename setup-calamares.sh references to setup-aur.sh
- Remove Calamares packages from package lists
- Add anaconda and liveimg payload packages
- Add Anaconda kickstart configuration (interactive-defaults.ks)
- Update boot sequence documentation: remove Calamares desktop selection, simplify to Openbox live environment
- Remove Calamares-specific troubleshooting entries
- Clean up .xinitrc and .zlogin to remove Calamares launcher
- Update build scripts to reference local repo generically instead of Calamares-specific

build.sh

@@ -154,9 +154,9 @@ echo "==> Vérification des services systemd..."
 ls /tmp/fws-build/releng/airootfs/etc/systemd/system/ 2>/dev/null || echo "  (aucun service)"
 ls /tmp/fws-build/releng/airootfs/etc/systemd/system/multi-user.target.wants/ 2>/dev/null || echo "  (aucun symlink)"
 
-# Copie le repo local (calamares + winboat-bin)
+# Copie le repo local (winboat-bin + deps Anaconda packagées)
 if ls "$WORK_DIR/local-repo/"*.pkg.tar.zst &>/dev/null 2>&1; then
-    echo "==> Copie du repo local Calamares..."
+    echo "==> Copie du repo local fws-local..."
     mkdir -p /tmp/fws-build/local-repo
     cp -a "$WORK_DIR/local-repo/"* /tmp/fws-build/local-repo/