feat(one): add configurable route loading modes

[natew]

Summary

• Add createRouteConfig() helper for typed route configuration
• Add loading modes: 'blocking', 'instant', or number (milliseconds)
• SSG/SSR routes default to blocking, SPA routes default to instant
• Cache loading mode on route node after first load for performance

Usage

import { createRouteConfig } from 'one'

export const config = createRouteConfig({
  loading: 'blocking', // or 'instant' or 200 (ms)
})

Test plan

• Added comprehensive test suite covering all loading modes
• Tests pass in both dev and prod modes (13/13)
• CI tests pass

[railway-app]

🚅 Deployed to the one-pr-652 environment in onestack.dev

Service	Status	Web	Updated (UTC)
one	❌ Build Failed (View Logs)	Web	Jan 19, 2026 at 8:55 pm