feat: initial commit — storefront, convex backend, and shared packages

Completes the first milestone of The Pet Loft ecommerce platform:
- apps/storefront: full customer-facing Next.js app with HeroUI (cart,
  checkout, orders, wishlist, product detail, shop, search, auth)
- convex/: serverless backend with schema, queries, mutations, actions,
  HTTP routes, Stripe/Shippo integrations, and co-located tests
- packages/types, packages/utils, packages/convex: shared workspace packages

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -0,0 +1,54 @@
+{
+  "name": "ecommerce",
+  "version": "0.0.1",
+  "private": true,
+  "packageManager": "npm@11.6.2",
+  "workspaces": [
+    "apps/*",
+    "packages/*"
+  ],
+  "scripts": {
+    "dev": "turbo dev",
+    "build": "turbo build",
+    "lint": "turbo lint",
+    "type-check": "turbo type-check",
+    "dev:storefront": "turbo dev --filter=storefront",
+    "dev:admin": "turbo dev --filter=admin",
+    "build:storefront": "turbo build --filter=storefront",
+    "build:admin": "turbo build --filter=admin",
+    "test": "vitest",
+    "test:once": "vitest run",
+    "test:coverage": "vitest run --coverage --coverage.reporter=text"
+  },
+  "dependencies": {
+    "@clerk/backend": "^2.32.1",
+    "@tailwindcss/postcss": "^4.2.0",
+    "convex": "^1.32.0",
+    "next": "^15.3.2",
+    "react": "^19.2.4",
+    "react-dom": "^19.2.4",
+    "stripe": "^20.4.0",
+    "svix": "^1.86.0",
+    "tailwindcss": "^4.2.0"
+  },
+  "devDependencies": {
+    "@edge-runtime/vm": "^5.0.0",
+    "@testing-library/react": "^16.3.2",
+    "@types/node": "^20.0.0",
+    "@types/react": "^19.2.14",
+    "@types/react-dom": "^19.2.3",
+    "autoprefixer": "^10.4.0",
+    "convex-test": "^0.0.41",
+    "eslint": "^9.0.0",
+    "eslint-config-next": "^15.3.2",
+    "happy-dom": "^20.7.0",
+    "postcss": "^8.4.0",
+    "shadcn": "^3.8.5",
+    "turbo": "^2.0.0",
+    "typescript": "^5.4.0",
+    "vitest": "^4.0.18"
+  },
+  "engines": {
+    "node": ">=18.0.0"
+  }
+}