Daemon mode (netleakd)

[MuriloChianfa]

Implement a background daemon (netleakd) to manage eBPF programs and cgroups, providing a persistent service for netleak. This will shift the architecture from an ephemeral CLI to a long-running service.

Tasks:

• Create the daemon architecture with a D-Bus or Unix socket API for IPC.
• Add support for reading configuration files (TOML/YAML).
• Implement session persistence across reboots.
• Support per-user and per-application routing policies.
• Add a Systemd service unit (netleakd.service) for lifecycle management.
• Investigate NetworkManager plugin integration.

[github-actions]

Welcome to netleak! Thanks for opening your first issue.

Please make sure you've included all the relevant information (OS, kernel version, steps to reproduce). If this is a security vulnerability, please report it privately via email instead -- see our Security Policy.

A maintainer will review your issue shortly.