Add Fluxon frontend storefront

frontend/INTEGRATION_CHECKLIST.md

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+# Fluxon Frontend Integration Checklist
+
+Use this with the backend teammate before switching any feature from mock mode to real API.
+
+## Product endpoints
+- Route: `GET /api/product`
+- Route: `GET /api/product/{id}`
+- Response fields: `id`, `name`, `description`, `price`, `stock`, `categoryId`
+- Nice to have: nested `category`
+
+## Category endpoint
+- Route: `GET /api/category`
+- Response fields: `id`, `name`
+
+## Auth endpoints
+- Route: `POST /api/auth/login`
+- Route: `POST /api/auth/register`
+- Request body:
+  - Login: `email`, `password`
+  - Register: `name`, `email`, `password`
+- Response: token plus customer identity fields
+
+## Order endpoint
+- Route: `GET /api/order`
+- Route: `POST /api/order`
+- Request body should accept:
+  - customer/shipping data
+  - `items[]` with `productId`, `quantity`, `unitPrice`
+- Response should include:
+  - order id
+  - created date
+  - total
+  - status
+  - payment status
+
+## Frontend env switch
+- Mock mode default: `VITE_USE_MOCK_API=true`
+- Real API mode: set `VITE_USE_MOCK_API=false`
+- API base URL: `VITE_API_BASE_URL=http://localhost:5276`