feat: initial monorepo scaffold - Next.js 15 + Prisma + Python SDK stubs

- Turborepo monorepo with apps/web and packages/database, sdk-python
- Next.js 15 app with professional landing page (dark theme, emerald accent)
- Prisma schema: Trace, DecisionPoint, Span, Event models with full indexing
- Docker Compose: web (port 4200), postgres:16, redis:7, migrate service
- Python SDK package stubs: init, trace decorator, log_decision, integrations
- Multi-stage Dockerfile for standalone Next.js production build

apps/web/package.json

@@ -0,0 +1,30 @@
+{
+  "name": "@agentlens/web",
+  "version": "0.0.1",
+  "private": true,
+  "scripts": {
+    "dev": "next dev",
+    "build": "next build",
+    "start": "next start",
+    "lint": "next lint",
+    "db:generate": "prisma generate --schema=../../packages/database/prisma/schema.prisma",
+    "db:push": "prisma db push --schema=../../packages/database/prisma/schema.prisma",
+    "db:migrate": "prisma migrate deploy --schema=../../packages/database/prisma/schema.prisma"
+  },
+  "dependencies": {
+    "@agentlens/database": "*",
+    "next": "^15.1.0",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
+    "lucide-react": "^0.469.0"
+  },
+  "devDependencies": {
+    "@tailwindcss/postcss": "^4.0.0",
+    "@types/node": "^22.0.0",
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
+    "postcss": "^8.5.0",
+    "tailwindcss": "^4.0.0",
+    "typescript": "^5.7"
+  }
+}