Potential fix for code scanning alert no. 16: Incorrect conversion between integer types

[Lawrence Lucas Large (LukeLarge)]

Potential fix for https://github.com/LukeLarge/opentonapi/security/code-scanning/16

The best fix is to enforce bound checks for the parsed value in convertJettonDecimals in pkg/api/normalized_metadata.go. Specifically, after parsing with strconv.Atoi, check that the resulting int value is in the valid range for an int32 (0 to math.MaxInt32). If not, return a safe default (such as 9). This ensures that all uses of this value throughout the code, even if future code is added, are safe and always within the range that can be safely cast to int32.

Make this change in the implementation of convertJettonDecimals in pkg/api/normalized_metadata.go, adding an explicit bounds check (using the math package, which is already imported).

No changes are required elsewhere in the code, since the value is now always sanitized at source.

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Pull request overview

This PR attempts to fix a code scanning alert regarding incorrect conversion between integer types by adding bounds checking to the convertJettonDecimals function. The fix validates that parsed decimal values fall within the valid int32 range (0 to math.MaxInt32) before returning them, defaulting to 9 for out-of-bounds values.

• Added bounds check to ensure parsed integer values are within int32 range
• Returns safe default value (9) for negative or excessively large values
• Prevents potential integer overflow issues when converting to int32

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The math package is not imported but math.MaxInt32 is being used here. This will cause a compilation error. Add "math" to the import block at the top of the file to fix this issue.