feat: add new system optimization tasks and implement orphaned startup item cleanup

tests/tmp-clean-home.IdiWGJ/.config/mole/clean-list.txt

@@ -0,0 +1,27 @@
+# Mole Cleanup Preview - 2025-12-29 19:05:19
+#
+# How to protect files:
+# 1. Copy any path below to ~/.config/mole/whitelist
+# 2. Run: mo clean --whitelist
+#
+# Example:
+#   /Users/*/Library/Caches/com.example.app
+#
+
+
+=== User essentials ===
+/Users/tw93/www/Mole/tests/tmp-clean-home.IdiWGJ/Library/Caches/TestApp  # 4KB
+
+=== Finder metadata ===
+
+=== macOS system caches ===
+
+=== Sandboxed app caches ===
+
+=== Browsers ===
+
+=== Cloud storage ===
+
+=== Office applications ===
+
+=== Developer tools ===