Corrosion Inhibition and Adsorption Properties of ethyl (Z)-2-(2-(4-methylbenzylidene)-3-oxo-2,3-dihydro-4H-[1,4]benzothiazin-4-yl)acetate(BHNS)on C38 Steel in 1 M HCl: crystal structure, Hirshfeld surface analysis, Insights from Electrochemical Analysis, DFT, and MD Simulations