Fix hasInputFluids check to prevent shaped recipe compression

[Copilot]

JEIPacket serializes fixed-size arrays with empty NBT tags for null slots, so inputFluids.length > 0 is always true even when no fluids exist. This made preserveSlots always false, breaking shaped crafting by compressing item positions.

Changes

• Added hasAnyFluids() helper - Scans array for any non-null FluidStack with amount > 0
• Fixed fluid detection logic - Both hasInputFluids and hasOutputFluids now use hasAnyFluids() instead of length checks

protected static boolean hasAnyFluids(@Nullable FluidStack[] fluids) {
    if (fluids == null)
        return false;
    
    for (FluidStack fluid : fluids) {
        if (fluid != null && fluid.amount > 0)
            return true;
    }
    
    return false;
}

This ensures shaped recipes preserve slot positions when no fluids are present, while still switching to processing mode when fluids exist.

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