Replace Docusaurus with Fumadocs v10.1.2

[Copilot]

Migrated the Casbin documentation site from Docusaurus to Fumadocs v10.1.2 as a Next.js 14 application.

Changes

Core Framework

• Removed: Docusaurus 3.9.2 and all related dependencies
• Added: Fumadocs v10.1.2 (fumadocs-ui@10.1.2, fumadocs-core@10.1.2)
• Added: Next.js 14.2.0 with App Router
• Added: Tailwind CSS 3.4 with Fumadocs preset

Configuration

• next.config.mjs - Next.js config with @next/mdx support
• tailwind.config.js - Tailwind with Fumadocs UI preset
• tsconfig.json - TypeScript configuration for Next.js
• eslint.config.mjs - ESLint 9.0 flat config (replaces legacy .eslintrc)
• Updated package.json scripts: dev, build, serve now use Next.js

Application Structure

app/
├── layout.tsx          # Root layout with RootProvider
├── page.tsx            # Home page
├── global.css          # Tailwind base styles
└── docs/
    ├── layout.tsx      # Docs layout with DocsLayout component
    ├── overview/       # Sample doc page
    └── get-started/    # Sample doc page

Preserved Files

• Old Docusaurus files renamed with .backup or moved to src.docusaurus.backup/
• Original docs/ content intact for future migration
• Static assets, blog, and i18n folders preserved

Screenshots

Home Page:

Documentation Page with Sidebar:

What Works

• Build succeeds: yarn build generates static output
• Dev server: yarn dev runs on localhost:3000
• Fumadocs UI: Navigation, sidebar, theme toggle, search UI
• Two sample documentation pages demonstrate the pattern

Remaining Work

• Migrate 60+ MDX files from docs/ to app/ structure
• Port sidebar configuration from sidebars.js
• Recreate custom components and styling
• Add blog, ecosystem, editor, gallery, help pages
• Configure i18n for 17 languages

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[feature] replace Docusaurus with Fumadocs v10.1.2</issue_title>
<issue_description>https://www.fumadocs.dev/</issue_description>

<agent_instructions>migrating from Docusaurus to Fumadocs </agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes [feature] replace Docusaurus with Fumadocs v10.1.2 #352

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