feat(pds): make pds into a library and add a cli (#18)

* feat: add deployment architecture and demo PDS

- Document zero-code re-export deployment pattern
- Create demo PDS deployment using re-export pattern
- Add interactive setup script for key generation and configuration
- Include comprehensive deployment documentation

## Architecture

Uses a zero-code re-export pattern where users simply re-export the main package:
```typescript
export { default, AccountDurableObject } from '@ascorbic/pds-worker';
```

## Setup Script

Interactive script (`scripts/setup-pds.js`) that:
- Prompts for hostname and handle
- Generates secp256k1 keypair
- Creates DID (did:web based on hostname)
- Generates random auth token
- Writes configuration to .dev.vars

## Demo Structure

- `demos/pds/src/index.ts` - Simple re-export
- `demos/pds/wrangler.jsonc` - Worker configuration
- `demos/pds/.env.example` - Environment template
- `demos/pds/README.md` - Setup and deployment guide

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

* feat(pds): setup cli

* feat: split library from worker

* Add a CLI!

* Remove unused arch doc

* chore: update config

---------

Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: ascorbic

.npmrc

@@ -0,0 +1 @@
+link-workspace-packages=true

.prettierignore

@@ -1,3 +1,5 @@
 package.json
 CHANGELOG.md
 pnpm-lock.yaml
+packages/pds/src/lexicons
+**/*.jsonc