feat: restructure into XFlow monorepo with Nuxt 4, Modular Onion Monolith, Android client, and Desktop CLI

apps/web/server/api/push/subscribe.post.ts

@@ -0,0 +1,16 @@
+import { requireAuth } from '~/server/utils/auth'
+import { pushSubscriptions } from '~/server/utils/db'
+
+export default defineEventHandler(async (event) => {
+  const user = requireAuth(event)
+  const body = await readBody(event)
+  const { subscription } = body
+
+  if (!subscription?.endpoint) {
+    throw createError({ statusCode: 400, message: 'Invalid subscription' })
+  }
+
+  pushSubscriptions.set(user.id, { userId: user.id, subscription, createdAt: new Date().toISOString() })
+
+  return { success: true }
+})