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/inbound/vless.ts

@@ -23,9 +23,6 @@ export const VlessClientSchema = z.object({
   subId: z.string().default(''),
   comment: z.string().default(''),
   reset: z.number().int().min(0).default(0),
-  // VLESS simple reverse-proxy: which reverse tag this client routes to,
-  // plus an optional sniffing override for that path. Distinct from the
-  // inbound-level `fallbacks` feature.
   reverse: z
     .object({
       tag: z.string(),
@@ -42,9 +39,6 @@ export const VlessInboundSettingsSchema = z.object({
   decryption: z.string().min(1).default('none'),
   encryption: z.string().min(1).default('none'),
   fallbacks: z.array(VlessFallbackSchema).default([]),
-  // TODO: narrow to flow === 'xtls-rprx-vision' once a per-flow discriminator
-  // exists. 4-positive-int padding seed for xtls-rprx-vision; backend uses
-  // safe defaults when omitted.
   testseed: z.array(z.number().int().positive()).length(4).optional(),
 });
 export type VlessInboundSettings = z.infer<typeof VlessInboundSettingsSchema>;