build(packaging): set up multi-platform packaging and CI/CD

- Add GitHub Actions workflows for CI and releases
- Create icon generation script and SVG source
- Configure electron-builder for macOS, Windows, Linux
- Add macOS entitlements for code signing
- Add Linux post-install/remove scripts
- Enhance package.json with publishing scripts
- Add artifact naming convention

scripts/linux/after-install.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+# Post-installation script for ClawX on Linux
+
+set -e
+
+# Update desktop database
+if command -v update-desktop-database &> /dev/null; then
+    update-desktop-database -q /usr/share/applications || true
+fi
+
+# Update icon cache
+if command -v gtk-update-icon-cache &> /dev/null; then
+    gtk-update-icon-cache -q /usr/share/icons/hicolor || true
+fi
+
+# Create symbolic link for CLI access (optional)
+if [ -x /opt/ClawX/clawx ]; then
+    ln -sf /opt/ClawX/clawx /usr/local/bin/clawx 2>/dev/null || true
+fi
+
+echo "ClawX has been installed successfully."

scripts/linux/after-remove.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+# Post-removal script for ClawX on Linux
+
+set -e
+
+# Remove symbolic link
+rm -f /usr/local/bin/clawx 2>/dev/null || true
+
+# Update desktop database
+if command -v update-desktop-database &> /dev/null; then
+    update-desktop-database -q /usr/share/applications || true
+fi
+
+# Update icon cache
+if command -v gtk-update-icon-cache &> /dev/null; then
+    gtk-update-icon-cache -q /usr/share/icons/hicolor || true
+fi
+
+echo "ClawX has been removed."