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/mosh/THANKS

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+* Hari Balakrishnan, who advised this work and came up with the name.
+
+* Paul Williams (www.vt100.net), whose reverse-engineered vt500 state
+  diagram is the basis for the Mosh parser.
+
+* The anonymous users who contributed session logs for tuning and
+  measuring Mosh's predictive echo.
+
+* Nickolai Zeldovich for helpful comments on the Mosh research paper.
+
+* Richard Stallman for helpful discussion about the capabilities of
+  the SUPDUP Local Editing Protocol.
+
+* Nelson Elhage
+
+* Christine Spang
+
+* Stefie Tellex
+
+* Joseph Sokol-Margolis
+
+* Waseem Daher
+
+* Bill McCloskey
+
+* Austin Roach
+
+* Greg Hudson
+
+* Karl Ramm
+
+* Alexander Chernyakhovsky
+
+* Peter Iannucci
+
+* Evan Broder
+
+* Neha Narula
+
+* Katrina LaCurts
+
+* Ramesh Chandra
+
+* Peter Jeremy
+
+* Ed Schouten
+
+* Ryan Steinmetz
+
+* Jay Freeman
+
+* Dave Täht
+
+* Larry Doolittle
+
+* Daniel Drown
+
+* Timo Juhani Lindfors
+
+* Timo Sirainen
+
+* Ira Cooper
+
+* Felix Gröbert
+
+* Luke Mewburn
+
+* Anton Lundin
+
+* Philipp Haselwarter
+
+* Timo J. Rinne
+
+* Barosl Lee
+
+* Andrew Chin
+
+* Louis Kruger
+
+* Jérémie Courrèges-Anglas
+
+* Pasi Sjöholm
+
+* Richard Woodbury
+
+* Igor Bukanov
+
+* Geoffrey Thomas