Update QUIC params defaults and UI validations

#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.

web/assets/js/model/inbound.js

@@ -1207,15 +1207,15 @@ class QuicParams extends XrayCommonClass {
     constructor(
         congestion = 'bbr',
         debug = false,
-        brutalUp = '',
-        brutalDown = '',
+        brutalUp = 65537,
+        brutalDown = 65537,
         udpHop = undefined,
         initStreamReceiveWindow = 8388608,
         maxStreamReceiveWindow = 8388608,
         initConnectionReceiveWindow = 20971520,
         maxConnectionReceiveWindow = 20971520,
         maxIdleTimeout = 30,
-        keepAlivePeriod = 0,
+        keepAlivePeriod = 5,
         disablePathMTUDiscovery = false,
         maxIncomingStreams = 1024,
     ) {
@@ -1265,8 +1265,10 @@ class QuicParams extends XrayCommonClass {
     toJson() {
         const result = { congestion: this.congestion };
         if (this.debug) result.debug = this.debug;
-        if (this.brutalUp) result.brutalUp = this.brutalUp;
-        if (this.brutalDown) result.brutalDown = this.brutalDown;
+        if (['brutal', 'force-brutal'].includes(this.congestion)) {
+            if (this.brutalUp) result.brutalUp = this.brutalUp;
+            if (this.brutalDown) result.brutalDown = this.brutalDown;
+        }
         if (this.udpHop) result.udpHop = { ports: this.udpHop.ports, interval: this.udpHop.interval };
         if (this.initStreamReceiveWindow > 0) result.initStreamReceiveWindow = this.initStreamReceiveWindow;
         if (this.maxStreamReceiveWindow > 0) result.maxStreamReceiveWindow = this.maxStreamReceiveWindow;