Refactor asset handling and authentication logic (for node)

Updated asset path configuration and server-side logic to standardize asset serving. Introduced `shouldSkipAuth` to bypass authentication for asset requests. Added test coverage for the new asset path handling logic.

app/src/core/config.ts

@@ -10,7 +10,8 @@ export interface DB {}
 
 export const config = {
    server: {
-      default_port: 1337
+      default_port: 1337,
+      assets_path: "/assets/"
    },
    data: {
       default_primary_field: "id"