feat: split ClaudeAlt into independent package

claude-alt/postinstall.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+set -euo pipefail
+
+sandbox=/usr/lib/claude-alt/chrome-sandbox
+if [[ ! -f "$sandbox" ]]; then
+    echo "Ошибка: не найден Electron sandbox: ${sandbox}" >&2
+    exit 1
+fi
+if [[ -L /proc/self/ns/user ]] && command -v unshare >/dev/null 2>&1 \
+    && unshare --user true 2>/dev/null; then
+    chmod 0755 "$sandbox"
+else
+    chmod 4755 "$sandbox"
+fi
+
+if command -v update-desktop-database >/dev/null 2>&1; then
+    update-desktop-database -q /usr/share/applications || true
+fi
+if command -v gtk-update-icon-cache >/dev/null 2>&1; then
+    gtk-update-icon-cache -f -q /usr/share/icons/hicolor || true
+fi