docs: fix MiniCPM Desk Pet install guidance

[YOIMIYA66]

Summary

This PR tightens the Desktop Pet / 桌宠 sections in the main MiniCPM README files so they match the current MiniCPM Desk Pet documentation and avoid sending users to stale Clawd-on-Desk-era instructions.

Changes made:

• Replace the stale Clawd-on-Desk-*-arm64.dmg installer name with the MiniCPM Desk Pet installer name documented by the Desk Pet repository: MiniCPM Desk Pet-*-arm64.dmg.
• Mention the Windows .exe installer path alongside the macOS DMG path, matching the Desk Pet README's platform-specific installation instructions.
• Apply the same install guidance fix to both README.md and README-cn.md.
• Update the platform wording from the broader and slightly misleading Apple Silicon / NVIDIA GPU / CPU paths phrase to the user-facing release targets documented in MiniCPM Desk Pet: macOS Apple Silicon and Windows x64 with Vulkan support.
• Align the persona wording with the Desk Pet README's Persona Adapters language while preserving the implementation detail that these adapters are backed by LoRA adapters.
• Fix the developer command by adding cd MiniCPM-Desk-Pet; the previous git clone ... && ./go.sh command would run ./go.sh from the parent directory and fail.
• Replace the stale #给开发者 README anchor with the current docs/development.md developer setup page.
• Align the onboarding wording with the Desk Pet README's first-launch flow by using environment checks, model download, and model warm-up / 环境检查、模型下载和模型预热 instead of the lower-level sidecar startup phrasing.

Reference Checked

I used the current OpenBMB/MiniCPM-Desk-Pet documentation as the source of truth for this cleanup:

• OpenBMB/MiniCPM-Desk-Pet README, Installation section:
  • macOS users are instructed to download MiniCPM Desk Pet-*-arm64.dmg from Releases.
  • Windows users are instructed to download the latest .exe installer.
• OpenBMB/MiniCPM-Desk-Pet README / README.zh-CN.md, System Requirements section:
  • macOS: 14.0+, Apple Silicon.
  • Windows: x64 with Vulkan support.
• OpenBMB/MiniCPM-Desk-Pet README / README.zh-CN.md, First Launch section:
  • The setup flow is documented as Environment Check -> Model Download -> Model Warm-up -> Ready to Use.
• OpenBMB/MiniCPM-Desk-Pet README / README.zh-CN.md, developer notes section:
  • Development setup is now routed to docs/development.md.
• OpenBMB/MiniCPM-Desk-Pet release metadata:
  • The latest release publishes macOS and Windows installer assets, so the main MiniCPM README files should not describe only a macOS DMG path.

Reference repository: https://github.com/OpenBMB/MiniCPM-Desk-Pet

Why This Matters

The previous MiniCPM README text mixed current MiniCPM Desk Pet guidance with stale upstream Clawd-on-Desk naming. That can confuse users in two ways:

1. The documented DMG name points users toward a non-MiniCPM artifact pattern.
2. Windows users are not told that the Desk Pet repository provides a Windows installer, even though the referenced project README documents one.

The developer-run command also needed a small but practical fix. Without changing into the cloned repository first, the command cannot find ./go.sh.

The same stale content existed in the Chinese README, so this PR keeps the English and Chinese Desktop Pet sections aligned.

Validation

• Confirmed the target README sections before and after the edit.
• Confirmed the stale strings are no longer present in README.md or README-cn.md:
  • Clawd-on-Desk-*-arm64.dmg
  • #给开发者
  • git clone ... && ./go.sh without cd MiniCPM-Desk-Pet
  • Apple Silicon / NVIDIA GPU / CPU
  • sidecar 启动
• Checked the replacement links return HTTP 200:
  • https://github.com/OpenBMB/MiniCPM-Desk-Pet/releases
  • https://github.com/OpenBMB/MiniCPM-Desk-Pet/blob/main/docs/development.md
  • https://raw.githubusercontent.com/OpenBMB/MiniCPM-Desk-Pet/main/README.md
• Ran git diff --check for the documentation diff.

No code paths or model behavior are changed by this PR.