refactor(NetworkConfigManager): remove provider and country from gateway configuration; integrate server details for improved filtering and UI display

example/s3/network-config.json

@@ -4,8 +4,6 @@
       "id": "gw-cloudflare-swe",
       "name": "SWE-IHOR",
       "ip": "94.142.140.1",
-      "provider": "cloudflare",
-      "country": "SWE",
       "description": "Cloudflare Sweden - основной выход",
       "serverId": "SWE-HIPHOST"
     },
@@ -13,8 +11,6 @@
       "id": "gw-bunny-swe",
       "name": "SWE-BUNNY",
       "ip": "94.142.140.2",
-      "provider": "bunny",
-      "country": "SWE",
       "description": "Bunny CDN Sweden",
       "serverId": "SWE-HIPHOST"
     },
@@ -22,8 +18,6 @@
       "id": "gw-telegram-nl",
       "name": "TG-PROXY-1",
       "ip": "149.154.167.50",
-      "provider": "telegram",
-      "country": "NL",
       "description": "Telegram DC2",
       "serverId": "NL-AMSTERDAM"
     },
@@ -31,8 +25,6 @@
       "id": "gw-hetzner-de",
       "name": "DE-HETZNER",
       "ip": "195.100.30.21",
-      "provider": "hetzner",
-      "country": "DE",
       "description": "Hetzner Frankfurt",
       "serverId": "DE-FRANKFURT"
     },
@@ -40,8 +32,6 @@
       "id": "gw-fastly-us",
       "name": "US-FASTLY",
       "ip": "151.101.1.1",
-      "provider": "fastly",
-      "country": "US",
       "description": "Fastly US East",
       "serverId": "US-NEWYORK"
     }