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).

src/index.ts

@@ -59,7 +59,24 @@ export default function discovery(
         updateConfig({
           integrations: [
             sitemap(config.sitemap || {})
-          ]
+          ],
+          vite: {
+            plugins: [{
+              name: '@astrojs/discovery:config',
+              resolveId(id) {
+                if (id === 'virtual:@astrojs/discovery/config') {
+                  return '\0' + id;
+                }
+                return null;
+              },
+              load(id) {
+                if (id === '\0virtual:@astrojs/discovery/config') {
+                  return `export default ${JSON.stringify(config, null, 2)};`;
+                }
+                return null;
+              }
+            }]
+          }
         });
 
         // Inject dynamic routes for discovery files

src/routes/humans.ts

@@ -1,12 +1,12 @@
 import type { APIRoute } from 'astro';
 import { generateHumansTxt } from '../generators/humans.js';
-import { getConfig } from '../config-store.js';
+// @ts-ignore - Virtual module
+import config from 'virtual:@astrojs/discovery/config';
 
 /**
  * API route for /humans.txt
  */
 export const GET: APIRoute = ({ site }) => {
-  const config = getConfig();
   const humansConfig = config.humans || {};
   const siteURL = site || new URL('http://localhost:4321');
 

src/routes/llms.ts

@@ -1,12 +1,12 @@
 import type { APIRoute } from 'astro';
 import { generateLLMsTxt } from '../generators/llms.js';
-import { getConfig } from '../config-store.js';
+// @ts-ignore - Virtual module
+import config from 'virtual:@astrojs/discovery/config';
 
 /**
  * API route for /llms.txt
  */
 export const GET: APIRoute = async ({ site }) => {
-  const config = getConfig();
   const llmsConfig = config.llms || {};
   const siteURL = site || new URL('http://localhost:4321');
 

src/routes/robots.ts

@@ -1,12 +1,12 @@
 import type { APIRoute } from 'astro';
 import { generateRobotsTxt } from '../generators/robots.js';
-import { getConfig } from '../config-store.js';
+// @ts-ignore - Virtual module
+import config from 'virtual:@astrojs/discovery/config';
 
 /**
  * API route for /robots.txt
  */
 export const GET: APIRoute = ({ site }) => {
-  const config = getConfig();
   const robotsConfig = config.robots || {};
   const siteURL = site || new URL('http://localhost:4321');