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/build/mosh/CMakeLists.txt

@@ -0,0 +1,83 @@
+cmake_minimum_required(VERSION 3.20)
+project(moshios CXX)
+
+# 直接编译 blinksh/mosh(ios 分支) 的 src/*.cc 为静态库，绕过 autotools。
+# 特性宏由同目录手写 config.h 提供（-I 本目录，且优先于 src 树内任何 config.h）。
+# 变量入参：
+#   MOSH_SRC      —— vendor/mosh/src 绝对路径
+#   PROTOBUF_SRC  —— vendor/protobuf/src 绝对路径（提供 protobuf-lite 头）
+if(NOT DEFINED MOSH_SRC)
+  message(FATAL_ERROR "MOSH_SRC 未设置")
+endif()
+if(NOT DEFINED PROTOBUF_SRC)
+  message(FATAL_ERROR "PROTOBUF_SRC 未设置")
+endif()
+
+set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS ON)          # gnu++14（mosh 用到 GNU 扩展）
+
+# 依据 src/*/Makefile.am 的 BUILD_IOS_CONTROLLER 分支精确选取源文件。
+# 关键：terminal 用 terminaldisplayinit_ios.cc（非 terminaldisplayinit.cc，后者需 ncurses）；
+#       frontend 仅取 moshiosbridge/iosclient/terminaloverlay（排除 mosh-client/server/mosh/stmclient）。
+set(MOSH_SOURCES
+  ${MOSH_SRC}/crypto/base64.cc
+  ${MOSH_SRC}/crypto/crypto.cc
+  ${MOSH_SRC}/crypto/ocb.cc
+  ${MOSH_SRC}/network/compressor.cc
+  ${MOSH_SRC}/network/network.cc
+  ${MOSH_SRC}/network/networktransport.cc
+  ${MOSH_SRC}/network/transportfragment.cc
+  ${MOSH_SRC}/network/transportsender.cc
+  ${MOSH_SRC}/statesync/completeterminal.cc
+  ${MOSH_SRC}/statesync/user.cc
+  ${MOSH_SRC}/terminal/parseraction.cc
+  ${MOSH_SRC}/terminal/parser.cc
+  ${MOSH_SRC}/terminal/parserstate.cc
+  ${MOSH_SRC}/terminal/terminal.cc
+  ${MOSH_SRC}/terminal/terminaldispatcher.cc
+  ${MOSH_SRC}/terminal/terminaldisplay.cc
+  ${MOSH_SRC}/terminal/terminaldisplayinit_ios.cc
+  ${MOSH_SRC}/terminal/terminalframebuffer.cc
+  ${MOSH_SRC}/terminal/terminalfunctions.cc
+  ${MOSH_SRC}/terminal/terminaluserinput.cc
+  ${MOSH_SRC}/util/locale_utils.cc
+  ${MOSH_SRC}/util/pty_compat.cc
+  ${MOSH_SRC}/util/select.cc
+  ${MOSH_SRC}/util/swrite.cc
+  ${MOSH_SRC}/util/timestamp.cc
+  ${MOSH_SRC}/protobufs/hostinput.pb.cc
+  ${MOSH_SRC}/protobufs/transportinstruction.pb.cc
+  ${MOSH_SRC}/protobufs/userinput.pb.cc
+  ${MOSH_SRC}/frontend/moshiosbridge.cc
+  ${MOSH_SRC}/frontend/iosclient.cc
+  ${MOSH_SRC}/frontend/terminaloverlay.cc
+)
+
+add_library(moshios STATIC ${MOSH_SOURCES})
+
+target_include_directories(moshios PRIVATE
+  ${CMAKE_CURRENT_SOURCE_DIR}          # 手写 config.h（必须最先）
+  ${MOSH_SRC}
+  ${MOSH_SRC}/crypto
+  ${MOSH_SRC}/network
+  ${MOSH_SRC}/statesync
+  ${MOSH_SRC}/terminal
+  ${MOSH_SRC}/util
+  ${MOSH_SRC}/protobufs
+  ${MOSH_SRC}/frontend
+  ${PROTOBUF_SRC}
+)
+
+# 1.3.2 老代码在 Xcode 26/新 clang 下告警多；关掉噪声，绝不开 -Werror。
+# 强制前置 <cstdint>：protobuf 3.21.12 的 stubs/port.h 用了 int8_t 却未自带 stdint 包含，
+# iOS SDK 头链比 host macOS 严格，会报 "unknown type name 'int8_t'"。全 TU 注入即修复。
+target_compile_options(moshios PRIVATE
+  "SHELL:-include cstdint"
+  -Wno-deprecated-declarations
+  -Wno-deprecated-register
+  -Wno-register
+  -Wno-unused-parameter
+  -Wno-writable-strings
+  -fno-strict-aliasing
+)