docs: add CLAUDE.md with project conventions

Define Slidev skill requirement, project structure, git commit
convention, CI/CD pipeline architecture (DooD with nginx on 8080),
and key commands.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

CLAUDE.md

@@ -0,0 +1,48 @@
+# Slide Project
+
+Slidev presentation project. Remote Gitea repo with Docker-based CI/CD auto-deployment.
+
+## Slidev Skill
+
+All slide-related operations (create, edit, format, build, export) MUST first invoke the `/slidev` skill and read its references at `~/.claude/skills/slidev/`.
+
+## Project Structure
+
+- `slides.md` — main slide entry point
+- `pages/` — additional slide files (imported via `src: ./pages/xxx.md`)
+- `public/` — static assets (images, fonts)
+- `.gitea/workflows/deploy.yaml` — CI/CD pipeline
+- `dist/` — build output (gitignored)
+
+## Git Commit Convention
+
+Use Conventional Commits (English):
+
+```
+type: description
+
+feat: add new slide deck for React hooks
+docs: update presenter notes for API talk
+fix: correct Mermaid diagram rendering
+chore: update Slidev dependencies
+```
+
+Types: `feat`, `fix`, `docs`, `style`, `refactor`, `chore`, `build`, `ci`
+
+After completing slide edits, auto-commit with a descriptive message.
+
+## Key Commands
+
+```bash
+pnpm run dev       # Local dev server (http://localhost:3030)
+pnpm run build     # Build static SPA → dist/
+pnpm run export    # Export to PDF (requires playwright-chromium)
+```
+
+## CI/CD Pipeline
+
+- **Trigger:** push to `main` branch
+- **Runner:** self-hosted Gitea Act Runner (label: `aliyun`), Docker mode with `/var/run/docker.sock` mounted
+- **Steps:** checkout → install deps → `slidev build` → deploy dist/ to nginx container
+- **Deploy:** CI job spawns a sibling nginx container on the host via the mounted Docker socket (Docker out of Docker, not DinD)
+- **Serve:** nginx container exposes port 8080