feat(inbounds): support Unix domain socket path in Listen field (#4429)

UDS listen already worked for proxying (the listen string is passed to xray verbatim and port 0 is accepted), and the Go sub/link layer already ignores the bind listen. The only gap was the frontend resolveAddr, which would put a socket-path listen into share/sub links (e.g. vless://uuid@/run/xray/x.sock:0). resolveAddr now treats a path-style listen (starting with / or @) as having no client-reachable address and falls back to hostOverride/hostname. Adds a test and a Listen-field help hint across all locales.

web/translation/es-ES.json

@@ -570,7 +570,8 @@
         "getNewCert": "Obtener nuevo cert",
         "mldsa65Seed": "mldsa65 Seed",
         "mldsa65Verify": "mldsa65 Verify",
-        "getNewSeed": "Obtener nuevo Seed"
+        "getNewSeed": "Obtener nuevo Seed",
+        "listenHelp": "También puedes introducir una ruta de socket Unix (p. ej. /run/xray/in.sock) para escuchar en un socket en lugar de un puerto TCP; en ese caso, establece el Puerto en 0."
       },
       "info": {
         "mode": "Modo",