refactor(index.js): validate pagination and clamp limit to 100 to prevent 1000s and preventing internal error 500

[UdayRajVadeghar]

1. Page parameter validation:

• Checks for NaN values
• Ensures the value is a positive integer (≥ 1)
• Validates that parseInt matches Number to reject decimals like "1.5"
• Sets a maximum page limit of 10,000 to prevent abuse
• Only validates when the parameter is provided (defaults to 1 if omitted)

2)Limit parameter validation:

• Checks for NaN values
• Ensures the value is a positive integer (≥ 1)
• Validates that parseInt matches Number to reject decimals like "1.5"
• Keeps the existing maximum of 100
• Only validates when the parameter is provided (defaults to 10 if omitted)

To sum it up these changes are done:

• Negative numbers are rejected
• Zero is rejected
• Non-integer decimals are rejected (e.g., "1.5")
• Invalid strings are rejected
• Empty strings are rejected
• Very large page numbers are prevented

Fixes #2

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