#4142
Adjust QUIC parameter defaults and tighten form validation across inbound/outbound components.
- Set default brutalUp/brutalDown to 65537 and only include them in JSON when congestion is 'brutal' or 'force-brutal'.
- Change keepAlivePeriod defaults (inbound QUIC -> 5s, Hysteria stream -> 2s) and enforce minimums in the UI.
- Expose and serialize additional QUIC fields in outbound QuicParams: init/max stream windows, init/max connection windows, maxIdleTimeout, disablePathMTUDiscovery, maxIncomingStreams.
- Add UI min/placeholder constraints: stream/connection receive windows min=16384 and updated placeholders to show defaults, brutal fields min=65537, maxIncomingStreams min=8 (placeholders updated), keepAlive min adjusted.
- Add Wireguard and Hysteria entries to Protocols.
Touched files: web/assets/js/model/inbound.js, web/assets/js/model/outbound.js, web/html/form/outbound.html, web/html/form/stream/stream_finalmask.html.
Treat the xdns mask type as a multi-value setting and update forms accordingly. Inbound/outbound UdpMask models now return arrays for xdns (inbound: settings.domains, outbound: settings.resolvers) using Array.isArray checks. UI templates were split so 'header-dns' still uses a single domain string, while 'xdns' renders a tags-style <a-select> for multiple entries (domains/resolvers). Conditionals were made explicit (mask.type === ...) instead of using includes(). Changed files: web/assets/js/model/inbound.js, web/assets/js/model/outbound.js, web/html/form/outbound.html, web/html/form/stream/stream_finalmask.html.
