Merge upstream v2.14.0

[GT-610]

Summary by CodeRabbit

• 新功能
  • 增加本地到远端 Unix 域套接字的 SSH 转发接口（等同于 ssh -L localPort:remoteSocketPath），并提供可运行示例。
• 错误修复
  • 修复在部分跳板/中继主机上连接时服务器立即发送版本字符串导致的连接问题。
• 文档
  • 发布 2.14.0 更新，调整变更日志格式并在 README 展示中新增 Naviterm 示例与截图。
• 测试
  • 调整建立 TCP 连接的测试目标以提升稳定性。

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 5b3852ab-b07c-43c8-9218-cbc7bf17a12c

📥 Commits

Reviewing files that changed from the base of the PR and between 01f6f1a and 79059a3.

📒 Files selected for processing (6)

• CHANGELOG.md
• example/forward_local_unix.dart
• lib/src/algorithm/ssh_mac_type.dart
• lib/src/ssh_algorithm.dart
• lib/src/ssh_client.dart
• test/src/algorithm/ssh_cipher_type_test.dart

✅ Files skipped from review due to trivial changes (2)

• lib/src/ssh_algorithm.dart
• lib/src/algorithm/ssh_mac_type.dart

🚧 Files skipped from review as they are similar to previous changes (3)

• lib/src/ssh_client.dart
• CHANGELOG.md
• example/forward_local_unix.dart

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📝 Walkthrough

Walkthrough

本 PR 发布 2.14.0，更新 pubspec 版本并在 CHANGELOG 中新增：修复堡垒主机在目标立即发送版本字符串时的连接问题及新增公有 API forwardLocalUnix()。新增示例 example/forward_local_unix.dart。消息通道增加对 direct-streamlocal@openssh.com 的支持（新增可选 socketPath 字段与工厂构造器）。调整默认 MAC 优先级以包含 96 位截断 SHA-2，更新 README 展示（加入 Naviterm），测试改用不同的 TCP 目标主机，并在一处文件添加尾注。

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	标题清晰准确地反映了PR的主要变更：从上游合并v2.14.0版本。标题与所有文件变更（包括版本更新、新功能、bug修复和测试）都相关联。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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