fix: eew intensity site effect

[Fonger]

Hi,

I've noticed a potential issue in the code where the regional site effect parameters might not be incorporated into the PGA formula. This is fixed by 8a9f0ad

Currently, the parameter seems to default to 1.751.

If this observation is correct, it could potentially lead to less precise seismic response calculations for various regions.

I believe integrating specific site effect parameters for each area could enhance the accuracy of our earthquake impact assessments.

TREM-tauri/src/scripts/helper/utils.ts

Lines 200 to 208 in 8a9f0ad

	export const calculateIntensity = (
	surfaceDistance: SurfaceDistanceToEpicenter,
	distance: DistanceToEpicenter,
	magnitude: number,
	depth: number,
	siteEffect: number = 1.751
	) => {
	const pga =
	1.657 * Math.exp(1.533 * magnitude) * distance ** -1.607 * siteEffect;

There's also a small optimization: 009c666
We can use the intensity map to get local intensity without re-calculation.

[Fonger]

@whes1015 Thanks for the review.

I see you enable auto-merge but it seems I need your approval to run the build workflow