Add Tactical Monolith design system and landing page to web app

Set up Tailwind CSS v4 with full design token system from Stitch project
(obsidian surfaces, neon cyan/magenta/lime palette, Space Grotesk + Inter
typography, 0px border-radius). Landing page includes hero section, side
nav, module cards, system status panels, terminal log, and CRT overlay.

apps/web/next-env.d.ts

@@ -0,0 +1,6 @@
+/// <reference types="next" />
+/// <reference types="next/image-types/global" />
+/// <reference path="./.next/types/routes.d.ts" />
+
+// NOTE: This file should not be edited
+// see https://nextjs.org/docs/app/api-reference/config/typescript for more information.