feat(dashboard): complete React cutover

docs/development.md

@@ -30,8 +30,6 @@ RedditBot/
 │   └── dashboard/           # React + Vite operator console
 ├── packages/
 │   └── api-contracts/       # Shared Zod transport contracts
-├── public/
-│   └── index.html           # Temporary legacy dashboard fallback
 ├── scripts/
 │   ├── login.ts             # Manual login helper
 │   └── inspect-chat-dom.ts  # DOM inspection debug script
@@ -521,9 +519,8 @@ Reddit frequently updates their `faceplate-*` components. Shadow DOM traversal c
 
 ### Dashboard Migration Boundary
 
-The React feature slices live in `apps/dashboard`, but `public/index.html`
-remains as a compatibility fallback. Do not delete it until authenticated
-Express hosting, private-media protection, and browser parity checks are proven.
+The React application lives in `apps/dashboard`. A production build is required
+before the Express server starts; there is no legacy HTML fallback.
 
 The repository has automated service, contract, component, and transport tests.
 Manual browser verification is still required for Reddit DOM changes and the