dev: expose 'web' from useapi as runtime module

This will allow extensions to import from the 'web' module:
const { Endpoint } = extension.import('web');

src/backend/src/modules/web/WebModule.js

@@ -18,6 +18,7 @@
  */
 
 const { AdvancedBase } = require("@heyputer/putility");
+const { RuntimeModule } = require("../../extension/RuntimeModule.js");
 
 /**
  * This module initializes a pre-configured web server and socket.io server.
@@ -33,6 +34,11 @@ class WebModule extends AdvancedBase {
         // Prevent extensions from loading incompatible versions of express
         useapi.def('web.express', require('express'));
         
+        // Extension compatibility
+        const runtimeModule = new RuntimeModule({ name: 'web' });
+        context.get('runtime-modules').register(runtimeModule);
+        runtimeModule.exports = useapi.use('web');
+        
         // === SERVICES === //
         const services = context.get('services');