Add CRM system for clothing store

[Copilot]

Bootstraps a clothing store CRM from an empty repo. Provides full customer, product, and order lifecycle management via a REST API and a single-page frontend.

Backend (server.js, db.js)

• SQLite schema: customers, products, orders, order_items with FK constraints
• REST API (Express): full CRUD for customers/products, order creation with multi-line-item support, order status transitions (pending → confirmed → shipped → delivered → cancelled), dashboard aggregate endpoint
• Rate limiting: express-rate-limit applied to all /api/ routes (500 req / 15 min)
• Stock guard: order creation validates product.stock >= quantity inside a transaction — rejects with 400 on shortfall and never writes partial state

Frontend (public/)

• Single-page app with sidebar nav: Dashboard, Customers, Orders, Products
• Dashboard shows live stats (customers, orders, revenue, pending) plus recent-orders and top-customers tables
• Customer profile modal includes full order history; order detail modal exposes inline status update
• All user-sourced strings passed through esc() (HTML-entity encoding) before DOM insertion

Example: insufficient-stock rejection

// POST /api/orders  { customer_id: 1, items: [{ product_id: 2, quantity: 9999 }] }
// → 400 { "error": "Insufficient stock for \"Slim Fit Jeans\" (available: 60)" }

Original prompt

crm