feat: turbostarter boilerplate

Production-ready Next.js boilerplate with:
- Runtime env validation (fail-fast on missing vars)
- Feature-gated config (S3, Stripe, email, OAuth)
- Docker + Coolify deployment pipeline
- PostgreSQL + pgvector, MinIO S3, Better Auth
- TypeScript strict mode (no ignoreBuildErrors)
- i18n (en/es), AI modules, billing, monitoring

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/ui/shared/package.json

@@ -0,0 +1,34 @@
+{
+  "name": "@turbostarter/ui",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "exports": {
+    "./globals.css": "./src/styles/globals.css",
+    "./assets": "./src/assets/index.ts",
+    ".": "./src/index.ts"
+  },
+  "scripts": {
+    "clean": "git clean -xdf .cache .turbo dist node_modules",
+    "build": "pnpm dlx tsx ./src/styles/themes/build.ts",
+    "format": "prettier --check . --ignore-path ../../../.gitignore",
+    "lint": "eslint",
+    "typecheck": "tsc --noEmit"
+  },
+  "prettier": "@turbostarter/prettier-config",
+  "devDependencies": {
+    "@turbostarter/eslint-config": "workspace:*",
+    "@turbostarter/prettier-config": "workspace:*",
+    "@turbostarter/tsconfig": "workspace:*",
+    "eslint": "catalog:",
+    "prettier": "catalog:",
+    "react": "catalog:react19",
+    "tailwind-merge": "3.3.1",
+    "typescript": "catalog:"
+  },
+  "dependencies": {
+    "class-variance-authority": "0.7.1",
+    "postcss": "8.5.6",
+    "tailwindcss": "4.1.16"
+  }
+}