Greptile Summary

This PR upgrades the fumadocs-core dependency from version ^15.0.16 to ^15.7.5 in the documentation application (apps/docs/package.json). This is a minor version bump that brings bug fixes and new features while maintaining backward compatibility. The upgrade is part of a broader effort to fix build issues, as indicated by the PR title and description mentioning "fix(build): fixed the build" and "update infra and remove railway".

The documentation site is built with Next.js 15.3.2 and React 19, and fumadocs is the framework used for generating the documentation. This upgrade likely resolves compatibility issues or build failures that were occurring with the older version, ensuring the documentation builds successfully in the current environment.

PR Description Notes:

• The PR template remains mostly unfilled with placeholder text
• No specific issue number is referenced despite the "Fixes #(issue)" placeholder
• Testing section and type of change checkboxes are not completed

Confidence score: 2/5

• This PR has a version mismatch risk that could cause compatibility issues between fumadocs packages
• Score lowered due to potential breaking changes from mismatched fumadocs package versions and incomplete PR information
• Pay close attention to apps/docs/package.json for version consistency across fumadocs dependencies

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