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/vmess.ts

@@ -3,9 +3,6 @@ import { z } from 'zod';
 import { PortSchema } from '@/schemas/primitives';
 import { VmessSecuritySchema } from '@/schemas/protocols/shared/vmess';
 
-// Vmess outbound persists in the standard Xray `vnext` shape:
-// { vnext: [{ address, port, users: [{ id, security }] }] }
-// — distinct from VLESS outbound which the panel stores flat.
 export const VmessOutboundUserSchema = z.object({
   id: z.uuid(),
   security: VmessSecuritySchema.default('auto'),