feat: Add breadcrumbs

[aXenDeveloper]

Improving Documentation

• Run pnpm lint:fix to fix formatting issues before opening the PR.
• Read the Docs Contribution Guide: https://vitnode.com/docs/dev/contribution

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Project	Deployment	Actions	Updated (UTC)
vitnode-docs	Ready	Preview, Comment	Jun 17, 2026 2:51pm

[gemini-code-assist]

Code Review

This pull request introduces a dynamic, localized breadcrumb system for VitNode plugins using Next.js Parallel Routes, updating layouts, documentation, and template structures accordingly. Feedback on these changes highlights several important issues: a potential runtime crash in resolve-breadcrumb.ts due to unguarded href values, missing default fallback files for the @breadcrumb slot in the create-vitnode-app template, a lack of error handling for the asynchronous fetcher call in breadcrumb-user-admin.tsx, undefined variables (offset and limit) in a documentation example, and a leftover debug navigation item in get-admin-nav.tsx.

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