feat: add bump-version.sh script for version management

Automates version bumps across all version source files:
- Cargo.toml (PRIMARY - workspace.package.version)
- debian/changelog (prepend new entry)
- debian/control (update Version field)
- scripts/build-package.sh (update VERSION variable)
- frontend/package.json (update version field)
- Stale references check after bump

Usage: ./scripts/bump-version.sh <new_version> <old_version>

debian/install

@@ -0,0 +1,9 @@
+usr/local/bin/pm-web
+usr/local/bin/pm-worker
+usr/local/bin/backup.sh
+usr/share/patch-manager/frontend/*
+usr/share/patch-manager/config.example.toml
+usr/share/patch-manager/migrations/*
+lib/systemd/system/patch-manager-web.service
+lib/systemd/system/patch-manager-worker.service
+lib/systemd/system/patch-manager.target