feat: Feature 3.1 — Landing page + blog + Phase 3 specs

Next.js 14+ web app in web/ directory:
- Landing page: Hero, How It Works, Features, 3-tier Pricing with
  founder badges, Footer with email capture
- Blog system: MDX-powered, /blog index + /blog/[slug] pages,
  reading time, Open Graph tags, JSON-LD structured data
- Auth pages: /login + /signup (Supabase Auth ready)
- Design system: dark theme, grade colors (A/B/C/D), BetonBLK voice
- 1 seed blog post: "How to Read Line Movement Like a Sharp"
- Specs for 3.2 (Scan UI), 3.3 (Bet Tracker), 3.4 (Stripe)

Build passes clean: 7 static pages generated.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

web/package.json

@@ -0,0 +1,29 @@
+{
+  "name": "web",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "dev": "next dev",
+    "build": "next build",
+    "start": "next start",
+    "lint": "next lint"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@supabase/supabase-js": "^2.99.3",
+    "@tailwindcss/postcss": "^4.2.2",
+    "@types/node": "^25.5.0",
+    "@types/react": "^19.2.14",
+    "gray-matter": "^4.0.3",
+    "next": "^16.2.1",
+    "next-mdx-remote": "^6.0.0",
+    "postcss": "^8.5.8",
+    "react": "^19.2.4",
+    "react-dom": "^19.2.4",
+    "tailwindcss": "^4.2.2",
+    "typescript": "^5.9.3"
+  }
+}