doc: Introduce the use of Nuclei XEC on qemu

[muxiff]

Important

Introduces documentation for using Nuclei XEC Ethernet on QEMU, detailing User and TAP network modes with setup instructions for Linux and Windows.

• Documentation:
  • Adds nuclei_xec.rst to document using Nuclei XEC Ethernet on QEMU.
  • Updates index.rst to include nuclei_xec.rst in the table of contents.
• Network Modes:
  • Describes User mode using Slirp library for NAT forwarding without root, with constraints like low throughput and no ICMP support.
  • Details TAP mode for high-performance networking, requiring root and manual configuration.
• Configuration:
  • Provides Linux setup for TAP mode, including IP forwarding and TAP device creation.
  • Provides Windows setup for TAP mode, including driver installation and NAT/firewall rules.

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[ellipsis-dev]

Caution

Changes requested ❌

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1. source/qemu/nuclei_xec.rst:132

• Draft comment:
  File is missing a trailing newline (EOF).
• Reason this comment was not posted:
  Comment did not seem useful. Confidence is useful = 0% <= threshold 50% This comment is purely informative and does not provide any actionable feedback or suggestions for improvement. It simply points out a missing newline at the end of the file, which is a minor formatting issue that does not affect functionality.

2. source/qemu/nuclei_xec.rst:6

• Draft comment:
  Typo: 'net work' in the text appears to have a space and should likely be 'network'.
• Reason this comment was not posted:
  Marked as duplicate.

3. source/qemu/nuclei_xec.rst:130

• Draft comment:
  Typo: 'QMEU运行' appears to be a misspelling. It should be 'QEMU运行'.
• Reason this comment was not posted:
  Marked as duplicate.

Workflow ID: wflow_SVT1uSJhrMOGkWeL

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[ellipsis-dev]

Typo: Consider replacing 'net work' with 'network' for consistency.

Suggested change

	QEMU官方关于net work的文档: https://wiki.qemu.org/Documentation/Networking
	QEMU官方关于network的文档: https://wiki.qemu.org/Documentation/Networking

[ellipsis-dev]

Typo: 'QMEU运行' should be 'QEMU运行'.

Suggested change

	**QMEU运行**
	**QEMU运行**

[fanghuaqi]

暂不合入，这个是开发中的特性，需要文档上标注下，这个是2025.10以后的下个版本的特性，然后需要提醒用户默认情况下，建议使用 user mode, 这个不需要管理员权限配置网络，也能满足绝大多数需求。

[fanghuaqi]

后续 @muxiff 需要补充一下Linux SDK dts需要修改的点，以及启动Linux以后怎么使用一些网络相关的命令便于测试。

[fanghuaqi]

等待2026.06正式发布版本的时候合入