chore: scaffold oO monorepo with architecture, roadmap, and module stubs

apps/web/README.md

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+# apps/web
+
+Next.js PWA. Phase 0 scope: three pages.
+
+| Route | Purpose |
+|---|---|
+| `/sign-in` | Google/Apple OAuth buttons. No form. |
+| `/connect` | List of integrations (cards). Tap → OAuth. Tap connected card → disconnect. |
+| `/` (tip) | Pure black background. One tip centered. Tap gestures: done / snooze / dismiss. |
+
+## Design notes
+
+- The tip page is the product. Treat it like a watch face.
+- Zero chrome, no nav bar, no settings icon while a tip is showing. Long-press reveals actions.
+- Offline-first: last tip is cached; reactions queued until reconnect.