refactor: use obs url in next-sdk playground

[kagol]

主要更新：

• NEXT-SDK Playground 改成直接访问 OBS 地址，提升加载性能

Summary by CodeRabbit

• Documentation

  • Updated local development setup instructions with required submodule initialization command for complete repository setup.

• Chores

  • Updated Next SDK playground URL to new static resource hosting location.

[coderabbitai]

Walkthrough

Updated the NEXT-SDKs playground iframe URL in a Vue component from ai.opentiny.design to a static hosting location at res-static.opentiny.design/next-sdk-playground/latest/index.html, and added git submodule initialization to the README.md setup documentation.

Changes

Cohort / File(s)	Summary
UI Component URL Update .vitepress/theme/components/customContent.vue	Updated hardcoded NEXT-SDKs playground URL from ai.opentiny.design to res-static.opentiny.design/next-sdk-playground/latest/index.html for iframe loading.
Documentation & Setup README.md	Updated code block language declaration from shell to bash and added git submodule update --init --recursive command to the local startup instructions.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰✨ A URL hops to new grounds so fine,
Static hosting serves the design,
Submodules initialized with care,
Setup instructions fresh in the air,
Our playground thrives over there!

🚥 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	The title accurately describes the main change: updating the NEXT-SDK playground URL from ai.opentiny.design to res-static.opentiny.design (OBS URL), which is the primary modification in the pull request.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch kagol/use-obs-url-in-next-sdk-playground

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No actionable comments were generated in the recent review. 🎉

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