chore: create CLAUDE file

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+Lite Note is a Vue 3 + TypeScript web app that displays markdown notes from GitHub repositories with Zettelkasten-style backlinks. Users access notes via `https://litenote.space/{user}/{repo}`. Supports both public repos (direct access) and private repos (GitHub OAuth).
+
+## Commands
+
+```bash
+pnpm dev          # Start development server
+pnpm build        # Production build
+pnpm test         # Run Vitest tests
+pnpm lint         # ESLint with auto-fix
+pnpm types        # TypeScript type-check
+```
+
+## Architecture
+
+### Tech Stack
+
+- **Vue 3** with Composition API, **Pinia** for state, **Vue Router**
+- **Vite** build tool, **TypeScript** strict mode
+- **Tailwind CSS** + **DaisyUI** for styling
+- **PouchDB** (IndexedDB) for local persistence
+- **Octokit** for GitHub API integration
+- **markdown-it** with plugins (KaTeX, Shikiji, Mermaid, checkboxes, GitHub alerts)
+
+### Directory Structure
+
+```sh
+src/
+├── views/           # Page components (FluxNoteView, FleetingNotes, etc.)
+├── components/      # Reusable UI components
+├── modules/         # Feature domains
+│   ├── note/        # Note models, hooks, caching
+│   ├── repo/        # GitHub repo integration (Pinia store, Octokit service)
+│   ├── user/        # Authentication, user settings
+│   ├── card/        # Spaced repetition
+│   └── history/     # Edit history tracking
+├── hooks/           # Composition hooks (useMarkdown, useBacklinks, useGitHubContent, etc.)
+├── data/            # PouchDB wrapper and data models
+├── utils/           # Utilities including custom markdown-it plugins
+├── locales/         # i18n (English/French)
+└── bus/             # Event buses for inter-component communication
+```
+
+### Key Files
+
+- `src/router/router.ts` - Route definitions, main route is `/:user/:repo`
+- `src/modules/repo/store/userRepo.store.ts` - Central Pinia store for repo/file state
+- `src/modules/repo/services/octo.ts` - Octokit wrapper for GitHub API
+- `src/hooks/useMarkdown.hook.ts` - Markdown rendering with all plugins
+- `src/data/data.ts` - PouchDB database wrapper
+
+### Patterns
+
+- All components use Composition API
+- Custom hooks encapsulate feature logic (`use*.hook.ts` or `use*.ts`)
+- Event buses (`noteEventBus`, `backlinkEventBus`) for cross-component communication
+- Path alias: `@` maps to `src/`