Build a Library Management API

Problem/Feature Description

A public library needs a REST API to manage its book catalog and lending operations. Build it using Spring Boot and Java.

Resources:

• Book: { id, title, author, isbn, totalCopies, availableCopies }
• Member: { id, name, email, membershipDate }
• Loan: { id, bookId, memberId, borrowDate, dueDate, returnDate, status }

Endpoints:

• GET /api/books -- list all books, support search by title or author query parameter
• GET /api/books/{id} -- get a single book by ID
• POST /api/books -- add a new book (title, author, isbn required; isbn must be unique; totalCopies >= 1)
• PUT /api/books/{id} -- update book details
• POST /api/members -- register a new member (name and email required, email must be unique)
• GET /api/members/{id} -- get member details
• POST /api/loans -- borrow a book (bookId and memberId required; book must have available copies; member cannot have more than 5 active loans)
• POST /api/loans/{id}/return -- return a borrowed book

Business rules:

• Due date is 14 days from borrow date
• A member cannot borrow the same book twice simultaneously
• ISBN format does not need to be validated beyond non-blank

Use an in-memory data structure or H2 embedded database.

Output Specification

Produce a complete Spring Boot project:

• src/main/java/com/example/ -- controller, service, model, and repository packages
• pom.xml or build.gradle -- with dependencies
• src/main/resources/application.properties -- configuration

You may create additional files as needed for a well-structured codebase.