Implement car reservation schedule management system

Co-authored-by: pdf114514 <57948770+pdf114514@users.noreply.github.com>
Agent-Logs-Url: https://github.com/pdf114514/CarReservation/sessions/1d8c6b05-0e8d-4484-a2d8-8d427dfad9cb

README.md

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 # CarReservation
+
+代車スケジュール管理システム — Car Rental Schedule Management System
+
+## Overview
+
+A web application for managing loaner car (代車) schedules at an auto shop.
+
+- **Frontend**: React + Vite
+- **Backend**: Express + SQLite (better-sqlite3)
+
+## Features
+
+- **Schedule View**: Table with cars as rows and dates as columns (21 days)
+- **Drag to Create**: Click and drag horizontally on empty cells to create a reservation
+- **Drag to Move**: Drag existing reservation blocks to move them to a new date/car
+- **Reservation Modal**: Create or edit reservations with car, dates, customer name, and notes
+- **Car Management**: Add, edit, and delete loaner cars
+
+## Getting Started
+
+### Prerequisites
+
+- Node.js 18+
+
+### Setup
+
+```bash
+# Install root dependencies (concurrently for dev)
+npm install
+
+# Install backend dependencies
+cd backend && npm install && cd ..
+
+# Install frontend dependencies
+cd frontend && npm install && cd ..
+```
+
+### Running
+
+```bash
+# Start backend (port 3001)
+npm run dev:backend
+
+# Start frontend (port 5173) in another terminal
+npm run dev:frontend
+
+# Or start both concurrently
+npm run dev
+```
+
+Open http://localhost:5173 in your browser.
+
+### API Endpoints
+
+| Method | Path | Description |
+|--------|------|-------------|
+| GET | /api/cars | List all cars |
+| POST | /api/cars | Create a car |
+| PUT | /api/cars/:id | Update a car |
+| DELETE | /api/cars/:id | Delete a car (cascades to reservations) |
+| GET | /api/reservations | List all reservations |
+| POST | /api/reservations | Create a reservation |
+| PUT | /api/reservations/:id | Update a reservation |
+| DELETE | /api/reservations/:id | Delete a reservation |