feat: add staging environment for Netcup deployment

- Update workerUrl.ts to support staging/dev environments pointing to Cloudflare dev worker
- 'staging' and 'dev' now use jeffemmett-canvas-automerge-dev worker
- 'local' still uses localhost:5172 for local development
- Set VITE_WORKER_ENV=staging when building for Netcup staging

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/constants/workerUrl.ts

@@ -2,15 +2,17 @@
 // You can easily switch between environments by changing the WORKER_ENV variable
 
 // Available environments:
-// - 'local': Use local worker running on port 5172
-// - 'dev': Use Cloudflare dev environment (jeffemmett-canvas-automerge-dev)
-// - 'production': Use production environment (jeffemmett-canvas)
+// - 'local': Use local worker running on port 5172 (for local development)
+// - 'dev': Use Cloudflare dev worker (jeffemmett-canvas-automerge-dev)
+// - 'staging': Use Cloudflare dev worker (same as dev, for Netcup staging)
+// - 'production': Use production worker (jeffemmett-canvas)
 
 const WORKER_ENV = import.meta.env.VITE_WORKER_ENV || 'production' // Default to production
 
 const WORKER_URLS = {
   local: `http://${window.location.hostname}:5172`,
-  dev: `http://${window.location.hostname}:5172`,
+  dev: "https://jeffemmett-canvas-automerge-dev.jeffemmett.workers.dev",
+  staging: "https://jeffemmett-canvas-automerge-dev.jeffemmett.workers.dev",
   production: "https://jeffemmett-canvas.jeffemmett.workers.dev"
 }
 
@@ -26,6 +28,7 @@ export const getWorkerInfo = () => ({
   url: WORKER_URL,
   isLocal: WORKER_ENV === 'local',
   isDev: WORKER_ENV === 'dev',
+  isStaging: WORKER_ENV === 'staging',
   isProduction: WORKER_ENV === 'production'
 })