S-UI-X Extended v1.0.4

Bugfix release for managed AmneziaWG endpoints.

• Fixed: saving any endpoint could stop sing-box from starting with endpoints[N].awgManaged: json: unknown field "awgManaged". The panel-only marker leaked into the stored endpoint options and from there into the core config. It is now stripped on save and at config render, so already-affected installations recover without a migration.
• Fixed: a managed AWG endpoint could be saved with a /32 host address, after which every reconcile failed with managed AWG endpoint address does not match awgSubnet. Saving now requires an IPv4 subnet of /30 or larger, a host address that is not the network or broadcast address, and a set listen_port.
• The endpoint form widens the generated default /32 to /24 when managed mode is turned on, and validates public endpoint, DNS, and address before sending the save request.

If you already have a managed endpoint with a /32 address, edit it once and widen the subnet (for example 10.0.0.20/32 to 10.0.0.20/24).

Full release notes: docs/releases/v1.0.4.md.