Implements a new question type where users enter a number within a configurable range. The correct answer is validated against a specific value within that range.

Model Layer

• GuessTheNumberQuestion with MinValue, MaxValue, and CorrectAnswer properties
• ClientGuessTheNumberQuestion and ClientGuessTheNumberAnswer for client-server communication
• Updated polymorphic type discriminators and JSON converters

UI Components

• Edit: Range configuration (min/max) and correct answer input
• Client: Number input with client-side range validation
• Presenter: Question display with correct answer visible to quiz host

Integration

• Added "Guess the Number" option to QuestionTypePickerModal
• Wired question type routing in Edit, Client, and Present QuestionPicker components
• Default values: range 0-100, answer 50, timeout 30s

new GuessTheNumberQuestion
{
    Title = "How many moons does Jupiter have?",
    MinValue = 1,
    MaxValue = 100,
    CorrectAnswer = 79,
    Timeout = 30
}

• Fixes Add GuessTheNumber question type #50

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