Fix integer overflow on 16-bit MCUs in timeout calculations

[Copilot]

This PR fixes an integer overflow issue that occurs when compiling for 16-bit MCUs like Arduino Uno, where int is only 16 bits.

Problem

The expression (90 * 1000) in the timeout calculation overflows on 16-bit systems because:

• 90 × 1000 = 90,000
• Maximum 16-bit signed int value = 32,767
• This causes a compiler warning: integer overflow in expression [-Woverflow]

On 16-bit systems, the overflow would produce an incorrect timeout value of 24,464 ms instead of the expected 90,000 ms.

Solution

Changed all timeout-related multiplication operations to use unsigned arithmetic:

// Before (overflows on 16-bit)
result = (90 * 1000);
result = (JGetInt(req, "seconds") * 1000);
timeoutMs = timeoutSeconds * 1000;

// After (safe on all platforms)  
result = (90U * 1000U);
result = (JGetInt(req, "seconds") * 1000U);
timeoutMs = timeoutSeconds * 1000U;

The U suffix ensures the multiplication is performed in unsigned arithmetic, which is guaranteed to be at least 32-bit, preventing overflow while maintaining identical functional behavior.

Changes

• n_request.c: Updated 4 multiplication operations to use unsigned constants
• test file: Updated test expectations for consistency

All changes are minimal and preserve existing functionality while eliminating the compiler warning on 16-bit MCUs.

Fixes #1.

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[zakoverflow]

This will overflow a 16-bit integer. You have failed the primary objective of this PR.

[Copilot]

Fixed the integer overflow by changing (90U * 1000U) to (90UL * 1000UL). The issue was that 90U * 1000U uses unsigned int arithmetic, which on 16-bit systems is still 16-bit (max 65,535), and 90 × 1000 = 90,000 overflows that. Using UL forces 32-bit unsigned long arithmetic. Also updated all other timeout multiplications for consistency. (commit a61c3b8)