feat(launch): waitlist page, raw-WebGPU hero, supabase + vercel infra

The July 14 launch surface, previously uncommitted:
- /dashboard/launch raw-WebGPU particle "memory brain" hero (RawVestigeEngine,
  NeuralWordmark, dendrite sign) + DOM waitlist overlay with share/referral.
- Supabase waitlist client + migrations + welcome edge function; legacy waitlist
  archived under supabase/legacy.
- vercel.json deploy config, root-redirect env wiring, base-path config,
  graph-only route, Playwright launch verifiers.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/dashboard/package.json

@@ -12,6 +12,7 @@
     "test:watch": "vitest"
   },
   "dependencies": {
+    "@supabase/supabase-js": "^2.108.2",
     "three": "^0.172.0"
   },
   "devDependencies": {