refactor(ai): Remove over-engineered URL discovery service

Keep only the simple AI-powered approach:
- set_resource_url tool lets AI save discovered URLs
- Users ask AI directly: 'Find URLs for my containers'
- AI uses its intelligence to discover and set URLs

Removed:
- URLDiscoveryService (rigid port scanning)
- Bulk discovery API endpoints
- Frontend discovery button

The AI itself is smart enough to iterate through resources
and discover URLs when asked.

cmd/pulse/main.go

@@ -184,6 +184,9 @@ func runServer() {
 	// This must be done after router creation since resourceHandlers is created in NewRouter
 	router.SetMonitor(reloadableMonitor.GetMonitor())
 
+	// Start AI patrol service for background infrastructure monitoring
+	router.StartPatrol(ctx)
+
 	// Create HTTP server with unified configuration
 	// In production, serve everything (frontend + API) on the frontend port
 	// NOTE: We use ReadHeaderTimeout instead of ReadTimeout to avoid affecting