v1.8.10: security audit fixes

- --list and --status no longer expose IP/port/user (only aliases)
- --list-full for admin use (not in skill)
- Removed --add from /ssh skill (servers added via GUI only)
- Removed exact file paths from skill template
- Added deny-read rules for ~/.server-connections/ files
- Wrapped main() in try/except to prevent traceback leaking
- Added needs_reencrypt() to encryption.py for future migration
- install_key no longer prints server IP

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

version.py

@@ -1,6 +1,6 @@
 """Version info for ServerManager."""
 
-__version__ = "1.8.8"
+__version__ = "1.8.10"
 __app_name__ = "ServerManager"
 __author__ = "aibot777"
 __description__ = "Desktop GUI for managing remote servers"