Deploy to Cloudflare Workers and rebrand to Diagrav

Adds Workers + static-assets configs for the app (app.diagrav.com) and a
separate marketing/landing site (diagrav.com), plus the deployment runbook
used to stand up Supabase Cloud, Google OAuth, Resend SMTP, and Cloudflare
DNS/custom domains. Renames the app from "AV Planner" to "Diagrav" to match
the new domain.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017DUU6CnxECCDeqDNYJgr5x

wrangler.app.jsonc

@@ -0,0 +1,19 @@
+// Deploys the built Vite app (dist/) as an assets-only Cloudflare Worker.
+// No server-side code — this is purely static hosting for app.diagrav.com.
+// Build first (with production VITE_* env vars baked in), then:
+//   npx wrangler deploy --config wrangler.app.jsonc
+{
+  "$schema": "./node_modules/wrangler/config-schema.json",
+  "name": "diagrav-app",
+  "compatibility_date": "2026-09-25",
+  "assets": {
+    "directory": "./dist",
+    "not_found_handling": "single-page-application"
+  },
+  "routes": [
+    {
+      "pattern": "app.diagrav.com",
+      "custom_domain": true
+    }
+  ]
+}