feat: restructure project for multi-deck support

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

CLAUDE.md

@@ -1,6 +1,6 @@
 # Slide Project
 
-Slidev presentation project. Remote Gitea repo with Docker-based CI/CD auto-deployment.
+Multi-deck Slidev presentation project. Remote Gitea repo with Docker-based CI/CD auto-deployment.
 
 ## Slidev Skill
 
@@ -8,11 +8,28 @@ All slide-related operations (create, edit, format, build, export) MUST first in
 
 ## 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)
+```
+index.html              # Landing page (lists all decks)
+decks/
+  <deck-name>/
+    slides.md             # Slide entry point
+    pages/                # Additional slide files (imported via src: ./pages/xxx.md)
+    public/               # Static assets (images, fonts)
+scripts/
+  build.sh                # Build all decks
+.gitea/workflows/         # CI/CD pipeline
+dist/                     # Build output (gitignored)
+```
+
+Each deck is an independent Slidev presentation under `decks/`. The build outputs to `dist/<deck-name>/` with the landing page at `dist/index.html`.
+
+## Adding a New Deck
+
+1. Create directory: `decks/<name>/`
+2. Add `decks/<name>/slides.md` with frontmatter
+3. Optionally add `pages/` and `public/` subdirectories
+4. Register in `index.html` decks array
+5. Add `dev:<name>` and `build:<name>` scripts to `package.json`
 
 ## Git Commit Convention
 
@@ -34,15 +51,17 @@ 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)
+pnpm run dev           # Dev server for demo deck (http://localhost:3030)
+pnpm run dev:<deck>    # Dev server for a specific deck
+pnpm run build         # Build all decks → dist/
+pnpm run build:<deck>  # Build a single deck
+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
+- **Steps:** checkout → install deps → `pnpm run 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
+- **Serve:** nginx container exposes port 8080, decks accessible at `/<deck-name>/`