Add AI-friendly API discovery endpoints

- Add /llms.txt for LLM/AI agent documentation
- Add /openapi.json for OpenAPI spec
- Update server.js to serve new endpoints
- Document all API endpoints with examples and payment info

These endpoints help AI agents discover and use the API correctly,
including x402 payment requirements.

bin/server.js

@@ -252,6 +252,19 @@ class Server {
         res.sendFile(docsPath)
       })
 
+      // AI-friendly discovery endpoints
+      app.get('/llms.txt', (req, res) => {
+        const llmsPath = join(__dirname, '..', 'public', 'llms.txt')
+        res.setHeader('Content-Type', 'text/plain')
+        res.sendFile(llmsPath)
+      })
+
+      app.get('/openapi.json', (req, res) => {
+        const openapiPath = join(__dirname, '..', 'public', 'openapi.json')
+        res.setHeader('Content-Type', 'application/json')
+        res.sendFile(openapiPath)
+      })
+
       // MIDDLEWARE END
 
       console.log(`Running server in environment: ${this.config.env}`)