OOP Lab 09: Book Inventory & Transaction Guard

Implement a Book class for a bookstore inventory system:

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  bookID (int): Unique identifier.
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  title (std::string): Title of the book.
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  price (double): Price per single copy.
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  stock (int): Available inventory copies.

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  Parameterized constructor: Book(int id, std::string t, double p, int s).
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  Method purchase(int quantity):
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  Bulk purchase limit: If quantity > 5, print error "[!] Bulk purchase limit exceeded (Max 5 copies per transaction)" and return false.
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  Stock validation: If quantity > stock, print error "[!] Insufficient stock available" and return false.
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  Non-positive quantity: If quantity <= 0, print error "[!] Invalid purchase quantity" and return false.
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  On successful validation: Deduct stock -= quantity, print confirmation and total cost, and return true.
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  display() const: Prints book ID, title, unit price, and current stock.

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  Create an array of Book objects representing store catalog.
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  Test valid purchases, bulk limit exceed attempts (> 5), and insufficient stock attempts.
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  Display updated catalog stock after transactions.