feat!: 移除内置公共服务器

- 移除公共 RustDesk ID 服务器 (用户需自行配置)
- 移除公共 TURN 服务器 (仅保留 Google STUN)
- 清理废弃代码: PublicServerInfo, is_using_public_server 等
- 更新前端 UI 和国际化文本
- 重新生成 TypeScript 类型

破坏性变更: 不再提供内置公共服务器。用户必须配置自己的
RustDesk 服务器和 TURN 服务器才能在生产环境中使用。

web/src/i18n/en-US.ts

@@ -570,18 +570,17 @@ export default {
     // WebRTC / ICE
     webrtcSettings: 'WebRTC Settings',
     webrtcSettingsDesc: 'Configure STUN/TURN servers for NAT traversal',
-    usingPublicIceServers: 'Using public ICE servers',
-    publicIceServersHint: 'Leave empty to use built-in public STUN/TURN servers for NAT traversal',
+    publicIceServersHint: 'Empty uses Google public STUN, configure your own TURN for production',
     stunServer: 'STUN Server',
     stunServerPlaceholder: 'stun:stun.l.google.com:19302',
-    stunServerHint: 'Custom STUN server (leave empty to use public server)',
+    stunServerHint: 'Custom STUN server (leave empty to use Google public server)',
     turnServer: 'TURN Server',
     turnServerPlaceholder: 'turn:turn.example.com:3478',
-    turnServerHint: 'Custom TURN relay server (leave empty to use public server)',
+    turnServerHint: 'Custom TURN relay server (required for production)',
     turnUsername: 'TURN Username',
     turnPassword: 'TURN Password',
     turnPasswordConfigured: 'Password already configured. Leave empty to keep current password.',
-    turnCredentialsHint: 'Credentials for TURN server authentication (only needed for custom servers)',
+    turnCredentialsHint: 'Credentials for TURN server authentication',
     iceConfigNote: 'Note: Changes require reconnecting the WebRTC session to take effect.',
   },
   virtualKeyboard: {
@@ -703,7 +702,7 @@ export default {
       serverSettings: 'Server Settings',
       rendezvousServer: 'ID Server',
       rendezvousServerPlaceholder: 'hbbs.example.com:21116',
-      rendezvousServerHint: 'Leave empty to use public server',
+      rendezvousServerHint: 'Configure your RustDesk server address',
       relayServer: 'Relay Server',
       relayServerPlaceholder: 'hbbr.example.com:21117',
       relayServerHint: 'Relay server address, auto-derived from ID server if empty',
@@ -711,10 +710,6 @@ export default {
       relayKeyPlaceholder: 'Enter relay server key',
       relayKeySet: '••••••••',
       relayKeyHint: 'Authentication key for relay server (if server uses -k option)',
-      publicServerInfo: 'Public Server Info',
-      publicServerAddress: 'Server Address',
-      publicServerKey: 'Connection Key',
-      usingPublicServer: 'Using public server',
       deviceInfo: 'Device Info',
       deviceId: 'Device ID',
       deviceIdHint: 'Use this ID in RustDesk client to connect',

web/src/i18n/zh-CN.ts

@@ -570,18 +570,17 @@ export default {
     // WebRTC / ICE
     webrtcSettings: 'WebRTC 设置',
     webrtcSettingsDesc: '配置 STUN/TURN 服务器以实现 NAT 穿透',
-    usingPublicIceServers: '正在使用公共 ICE 服务器',
-    publicIceServersHint: '留空以使用内置的公共 STUN/TURN 服务器进行 NAT 穿透',
+    publicIceServersHint: '留空将使用 Google 公共 STUN 服务器，TURN 服务器需自行配置',
     stunServer: 'STUN 服务器',
     stunServerPlaceholder: 'stun:stun.l.google.com:19302',
-    stunServerHint: '自定义 STUN 服务器（留空则使用公共服务器）',
+    stunServerHint: '自定义 STUN 服务器（留空则使用 Google 公共服务器）',
     turnServer: 'TURN 服务器',
     turnServerPlaceholder: 'turn:turn.example.com:3478',
-    turnServerHint: '自定义 TURN 中继服务器（留空则使用公共服务器）',
+    turnServerHint: '自定义 TURN 中继服务器（生产环境必须配置）',
     turnUsername: 'TURN 用户名',
     turnPassword: 'TURN 密码',
     turnPasswordConfigured: '密码已配置。留空则保持当前密码。',
-    turnCredentialsHint: '用于 TURN 服务器认证的凭据（仅自定义服务器需要）',
+    turnCredentialsHint: '用于 TURN 服务器认证的凭据',
     iceConfigNote: '注意：更改后需要重新连接 WebRTC 会话才能生效。',
   },
   virtualKeyboard: {
@@ -703,7 +702,7 @@ export default {
       serverSettings: '服务器设置',
       rendezvousServer: 'ID 服务器',
       rendezvousServerPlaceholder: 'hbbs.example.com:21116',
-      rendezvousServerHint: '留空则使用公共服务器',
+      rendezvousServerHint: '请配置您的 RustDesk 服务器地址',
       relayServer: '中继服务器',
       relayServerPlaceholder: 'hbbr.example.com:21117',
       relayServerHint: '中继服务器地址，留空则自动从 ID 服务器推导',
@@ -711,10 +710,6 @@ export default {
       relayKeyPlaceholder: '输入中继服务器密钥',
       relayKeySet: '••••••••',
       relayKeyHint: '中继服务器认证密钥（如果服务器使用 -k 选项）',
-      publicServerInfo: '公共服务器信息',
-      publicServerAddress: '服务器地址',
-      publicServerKey: '连接密钥',
-      usingPublicServer: '正在使用公共服务器',
       deviceInfo: '设备信息',
       deviceId: '设备 ID',
       deviceIdHint: '此 ID 用于 RustDesk 客户端连接',