new: add tproxy

lib/features/config_option/data/config_option_repository.dart

@@ -79,6 +79,12 @@ abstract class ConfigOptions {
     validator: (value) => isPort(value.toString()),
   );
 
+  static final tproxyPort = PreferencesNotifier.create<int, int>(
+    "tproxy-port",
+    2335,
+    validator: (value) => isPort(value.toString()),
+  );
+
   static final localDnsPort = PreferencesNotifier.create<int, int>(
     "local-dns-port",
     6450,
@@ -305,6 +311,7 @@ abstract class ConfigOptions {
     "direct-dns-address": directDnsAddress,
     "direct-dns-domain-strategy": directDnsDomainStrategy,
     "mixed-port": mixedPort,
+    "tproxy-port": tproxyPort,
     "local-dns-port": localDnsPort,
     "tun-implementation": tunImplementation,
     "mtu": mtu,
@@ -393,6 +400,7 @@ abstract class ConfigOptions {
         directDnsAddress: ref.watch(directDnsAddress),
         directDnsDomainStrategy: ref.watch(directDnsDomainStrategy),
         mixedPort: ref.watch(mixedPort),
+        tproxyPort: ref.watch(tproxyPort),
         localDnsPort: ref.watch(localDnsPort),
         tunImplementation: ref.watch(tunImplementation),
         mtu: ref.watch(mtu),

lib/features/config_option/overview/config_options_page.dart

@@ -266,6 +266,14 @@ class ConfigOptionsPage extends HookConsumerWidget {
                     digitsOnly: true,
                     validateInput: isPort,
                   ),
+                  ValuePreferenceWidget(
+                    value: ref.watch(ConfigOptions.tproxyPort),
+                    preferences: ref.watch(ConfigOptions.tproxyPort.notifier),
+                    title: t.config.tproxyPort,
+                    inputToValue: int.tryParse,
+                    digitsOnly: true,
+                    validateInput: isPort,
+                  ),
                   ValuePreferenceWidget(
                     value: ref.watch(ConfigOptions.localDnsPort),
                     preferences: ref.watch(ConfigOptions.localDnsPort.notifier),