feat: 完成 M2 mosh（LAN + tsnet 端到端验证）

- mosh(blinksh/ios C++)+protobuf-lite 交叉编译为 MoshCore.xcframework
  （CommonCrypto 后端、含 arm64 模拟器 slice；绕 autotools 用 CMake 直编 + 手写 config.h）
- tsnet 桥新增 UDP relay（StartMoshRelay：loopback↔tsnet.Dial 逐包搬运）
- MoshSession（pipe↔FILE*/pthread/SIGWINCH）+ MoshConnectScanner（TXCore，+4 单测=39）
- SSHTerminalModel 编排：SSH 引导 mosh-server→解析 MOSH CONNECT→relay→mosh 接管
- LAN 直连 + mosh-over-tsnet 均端到端验证通过，R1(tsnet UDP 数据报语义) 证伪

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

vendor/protobuf/examples/list_people.dart

@@ -0,0 +1,47 @@
+import 'dart:io';
+
+import 'dart_tutorial/addressbook.pb.dart';
+import 'dart_tutorial/addressbook.pbenum.dart';
+
+/// Iterates though all people in the AddressBook and prints info about them.
+void printAddressBook(AddressBook addressBook) {
+  for (var person in addressBook.people) {
+    print('Person ID: ${person.id}');
+    print('  Name: ${person.name}');
+    if (person.hasEmail()) {
+      print('  E-mail address:${person.email}');
+    }
+
+    for (var phoneNumber in person.phones) {
+      switch (phoneNumber.type) {
+        case Person_PhoneType.MOBILE:
+          print('   Mobile phone #: ');
+          break;
+        case Person_PhoneType.HOME:
+          print('   Home phone #: ');
+          break;
+        case Person_PhoneType.WORK:
+          print('   Work phone #: ');
+          break;
+        default:
+          print('   Unknown phone #: ');
+          break;
+      }
+      print(phoneNumber.number);
+    }
+  }
+}
+
+/// Reads the entire address book from a file and prints all
+/// the information inside.
+void main(List<String> arguments) {
+  if (arguments.length != 1) {
+    print('Usage: list_person ADDRESS_BOOK_FILE');
+    exit(-1);
+  }
+
+  // Read the existing address book.
+  final file = new File(arguments.first);
+  final addressBook = new AddressBook.fromBuffer(file.readAsBytesSync());
+  printAddressBook(addressBook);
+}