fix: use Vite virtual module for configuration instead of global state

The initial config-store approach failed because Astro's injected routes
run in isolated contexts during prerendering and don't have access to
global state set during astro:config:setup.

Solution: Created a Vite plugin that provides the configuration through
a virtual module (virtual:@astrojs/discovery/config) which routes can
import at build time.

Changes:
- Added Vite plugin in astro:config:setup hook
- Updated all route handlers to import from virtual module
- Changed version from date-based (2025.11.03) to semantic (1.0.0) per npm requirements
- Added @ts-ignore comments for virtual module imports

Testing: Verified in test project that all configuration now properly
passes through to generated files (robots.txt, llms.txt, humans.txt).

QUICKSTART.md

@@ -0,0 +1,131 @@
+# Quick Start Guide
+
+Get @astrojs/discovery up and running in 2 minutes!
+
+## Installation
+
+```bash
+npm install @astrojs/discovery
+```
+
+## Basic Setup
+
+**1. Add to your Astro config:**
+
+```typescript
+// astro.config.mjs
+import { defineConfig } from 'astro/config';
+import discovery from '@astrojs/discovery';
+
+export default defineConfig({
+  site: 'https://your-site.com', // Required!
+  integrations: [
+    discovery() // That's it!
+  ]
+});
+```
+
+**2. Build your site:**
+
+```bash
+npm run build
+```
+
+**3. Check the generated files:**
+
+Your site now has:
+- `/robots.txt` - Search engine instructions
+- `/llms.txt` - AI assistant context
+- `/humans.txt` - Team credits
+- `/sitemap-index.xml` - Site structure
+
+## Customize It
+
+Add some personality to your discovery files:
+
+```typescript
+discovery({
+  llms: {
+    description: 'My awesome website about web development',
+    instructions: `
+      When helping users:
+      - Check /docs for API documentation
+      - Be friendly and helpful
+      - Provide code examples
+    `,
+  },
+
+  humans: {
+    team: [{
+      name: 'Your Name',
+      role: 'Developer',
+      twitter: '@yourhandle'
+    }],
+    thanks: ['Coffee ☕', 'Open source community']
+  }
+})
+```
+
+## Common Patterns
+
+### Block specific paths
+
+```typescript
+discovery({
+  robots: {
+    additionalAgents: [{
+      userAgent: '*',
+      disallow: ['/admin', '/private']
+    }]
+  }
+})
+```
+
+### Add API documentation
+
+```typescript
+discovery({
+  llms: {
+    apiEndpoints: [
+      { path: '/api/search', description: 'Search API' },
+      { path: '/api/chat', method: 'POST', description: 'Chat endpoint' }
+    ]
+  }
+})
+```
+
+### Disable specific files
+
+```typescript
+discovery({
+  robots: { enabled: true },
+  llms: { enabled: true },
+  humans: { enabled: false } // Don't generate humans.txt
+})
+```
+
+## What's Next?
+
+- Read the [full documentation](README.md)
+- Check out [example configurations](example/)
+- See the [API reference](README.md#api-reference)
+
+## Troubleshooting
+
+**Files not generating?**
+- Make sure `site` is set in astro.config.mjs
+- Check your output mode (hybrid/server recommended)
+- Remove any static files from `/public/robots.txt`
+
+**Wrong URLs in files?**
+- Verify your `site` config matches your production domain
+- Check environment-specific configuration
+
+**Need help?**
+- [Open an issue](https://github.com/withastro/astro-discovery/issues)
+- [Read the docs](README.md)
+- [View examples](example/)
+
+---
+
+**Happy discovering! 🎉**