docs: update tiny-robot submodule to develop branch and add migration guide

[gene9831]

Summary by CodeRabbit

• Documentation
  • Added migration guides to the documentation for upgrading from previous versions, including guides for Bubble, useMessage, and useConversation.
  • Migration guides are now accessible from the main navigation menu.

[coderabbitai]

Walkthrough

The pull request updates the tiny-robot submodule branch to develop and pins it to a new commit hash. Migration guide support is added to the VitePress configuration with URL rewrites, a new navigation menu entry, and sidebar section for migration documentation.

Changes

Cohort / File(s)	Summary
Submodule Configuration .gitmodules, tiny-robot	Updated tiny-robot submodule branch from release/v0.3.x to develop and pinned to a new commit hash (558095a...).
Documentation Configuration .vitepress/config.mts	Added migration guide support with URL path rewrites, new navigation entry labeled "迁移指南", and expanded sidebar with migration guides for Bubble, useMessage, and useConversation.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 A migration path unfolds so bright,
Submodules leap to develop's light,
Navigation guides the way with care,
Bubble, Message, Conversation all there!
New rewrites dance through the code,
Leading users down the migration road! 🌟

🚥 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 summarizes the main changes: updating the tiny-robot submodule to the develop branch and adding migration guide documentation.
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 docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch gene9831/docs/tiny-robot-0.4.0

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@tiny-robot`:
- Line 1: The submodule reference points to a non-existent commit
558095a424930d99e079e6e1cf4fe8929d48c7b2; update the submodule entry to point at
a valid commit on the develop branch that contains the migration files for
/tiny-robot/migration/bubble, /tiny-robot/migration/useMessage, and
/tiny-robot/migration/useConversation. Verify by checking out the tiny-robot
repository’s develop branch, locating the correct commit that includes those
paths, and replace the broken commit hash in the submodule reference with that
valid commit SHA so submodule init/update will succeed. Ensure the updated
commit actually contains the expected migration guide files before pushing the
change.