feat(xray): add loopback sniffing and per-segment fragment masks

- Loopback outbound: add sniffing support (xray-core #6320)

- FinalMask fragment: support per-segment lengths/delays arrays with legacy length/delay migration (xray-core #6334)

- Consolidate sniffing into a shared SniffingFields component and the canonical SniffingSchema across inbound, VLESS reverse, and loopback

frontend/src/schemas/protocols/outbound/wireguard.ts

@@ -9,8 +9,6 @@ export const WireguardDomainStrategySchema = z.enum([
 ]);
 export type WireguardDomainStrategy = z.infer<typeof WireguardDomainStrategySchema>;
 
-// Outbound peer is the remote server we connect to: no privateKey, but an
-// `endpoint` (host:port) the inbound side does not need.
 export const WireguardOutboundPeerSchema = z.object({
   publicKey: z.string().min(1),
   preSharedKey: z.string().optional(),
@@ -20,9 +18,6 @@ export const WireguardOutboundPeerSchema = z.object({
 });
 export type WireguardOutboundPeer = z.infer<typeof WireguardOutboundPeerSchema>;
 
-// Wire format: address is a string[] (Xray expects an array even though the
-// panel UI stores it comma-joined); reserved is number[] (panel splits the
-// comma string and Number()-coerces each entry).
 export const WireguardOutboundSettingsSchema = z.object({
   mtu: z.number().int().min(1).optional(),
   secretKey: z.string().min(1),