add: cloudflared/Cloudflare Tunnel support

Fixes #949

lib/data/model/server/proxy_command_config.dart

@@ -1,4 +1,5 @@
 import 'package:freezed_annotation/freezed_annotation.dart';
+import 'package:server_box/core/utils/proxy_command_executor.dart' show ProxyCommandException;
 
 part 'proxy_command_config.freezed.dart';
 part 'proxy_command_config.g.dart';
@@ -65,6 +66,12 @@ const Map<String, ProxyCommandConfig> proxyCommandPresets = {
 extension ProxyCommandConfigExtension on ProxyCommandConfig {
   /// Get the final command with placeholders replaced
   String getFinalCommand({required String hostname, required int port, required String user}) {
+    if (!command.contains('%h') && !command.contains('%p') && !command.contains('%r')) {
+      throw ProxyCommandException(
+        message: 'Proxy command "$command" must include at least one placeholder (%h, %p, %r)',
+      );
+    }
+
     var finalCommand = command;
     finalCommand = finalCommand.replaceAll('%h', hostname);
     finalCommand = finalCommand.replaceAll('%p', port.toString());

lib/data/model/server/server_private_info.dart

@@ -22,7 +22,7 @@ part 'server_private_info.g.dart';
 abstract class Spi with _$Spi {
   const Spi._();
 
-  @JsonSerializable(includeIfNull: false)
+  @JsonSerializable(includeIfNull: false, explicitToJson: true)
   const factory Spi({
     required String name,
     required String ip,

lib/data/model/server/server_private_info.freezed.dart

@@ -237,7 +237,7 @@ return $default(_that.name,_that.ip,_that.port,_that.user,_that.pwd,_that.keyId,
 
 /// @nodoc
 
-@JsonSerializable(includeIfNull: false)
+@JsonSerializable(includeIfNull: false, explicitToJson: true)
 class _Spi extends Spi {
   const _Spi({required this.name, required this.ip, required this.port, required this.user, this.pwd, @JsonKey(name: 'pubKeyId') this.keyId, final  List<String>? tags, this.alterUrl, this.autoConnect = true, this.jumpId, this.custom, this.wolCfg, final  Map<String, String>? envs, @JsonKey(fromJson: Spi.parseId) this.id = '', this.customSystemType, final  List<String>? disabledCmdTypes, this.proxyCommand}): _tags = tags,_envs = envs,_disabledCmdTypes = disabledCmdTypes,super._();
   factory _Spi.fromJson(Map<String, dynamic> json) => _$SpiFromJson(json);

lib/data/model/server/server_private_info.g.dart

@@ -52,13 +52,13 @@ Map<String, dynamic> _$SpiToJson(_Spi instance) => <String, dynamic>{
   'alterUrl': ?instance.alterUrl,
   'autoConnect': instance.autoConnect,
   'jumpId': ?instance.jumpId,
-  'custom': ?instance.custom,
-  'wolCfg': ?instance.wolCfg,
+  'custom': ?instance.custom?.toJson(),
+  'wolCfg': ?instance.wolCfg?.toJson(),
   'envs': ?instance.envs,
   'id': instance.id,
   'customSystemType': ?_$SystemTypeEnumMap[instance.customSystemType],
   'disabledCmdTypes': ?instance.disabledCmdTypes,
-  'proxyCommand': ?instance.proxyCommand,
+  'proxyCommand': ?instance.proxyCommand?.toJson(),
 };
 
 const _$SystemTypeEnumMap = {