docs: add partner-guide.md

[xijing21]

Summary by Sourcery

Add a new partner integration guide describing how external RISC-V ecosystem resources can be onboarded into the RuyiSDK package management system.

Documentation:

• Document RuyiSDK package management architecture and supported resource types for RISC-V developers.
• Add detailed guidance for partners on source integration and binary distribution onboarding modes, including responsibilities and maintenance expectations.
• Describe the end-to-end collaboration workflow for requesting, authorizing, and publishing partner resources via RuyiSDK.

[sourcery-ai]

Reviewer's Guide

Adds a new Chinese-language partner integration guide document (partner-guide.md) describing how external partners can integrate RISC-V related resources into the RuyiSDK ecosystem, including architecture overview, integration modes, and collaboration workflow.

Sequence diagram for installing a package via partner self-hosted binary (方案B)

sequenceDiagram
    actor Developer
    participant RuyiClient
    participant PackagesIndex
    participant PartnerServer

    Developer ->> RuyiClient: 运行 ruyi install 包名
    RuyiClient ->> PackagesIndex: 查询包元数据
    PackagesIndex -->> RuyiClient: 返回版本信息与下载链接
    RuyiClient ->> PartnerServer: HTTP_HTTPS请求携带User_Agent_ruyi_版本号
    PartnerServer -->> RuyiClient: 返回二进制文件
    RuyiClient ->> RuyiClient: 校验哈希并安装
    RuyiClient -->> Developer: 安装结果与使用提示

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File-Level Changes

Change	Details	Files
Introduce a new partner integration guide documenting RuyiSDK package ecosystem, supported resource types, integration modes, and collaboration流程。	Add high-level introduction to RuyiSDK package manager and the scope of RISC-V related resources eligible for integration Document system architecture with a Mermaid diagram showing partners, build services, mirrors, and index repository Describe two main resource integration modes: source integration and binary distribution (with two sub-options: mirror hosting and partner-hosted downloads) including processes, authorization, and responsibilities Define collaboration workflow for partners, including issue/PR-based onboarding template, email-based contact, technical handoff, and release steps	Other/partner-guide.md

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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