4.
已知点\(C\)为圆\({{(x+\sqrt{3})}^{2}}+{{y}^{2}}=16\)的圆心,\(F( \sqrt{3} ,0)\),\(P\)是圆上的动点,线段\(FP\)的垂直平分线交\(CP\)于点\(Q\).
\((1)\)求点\(Q\)的轨迹\(D\)的方程;
\((2)\)设\(A(2,0)\),\(B(0,1)\),过点\(A\)的直线\(l_{1}\)与曲线\(D\)交于点\(M(\)异于点\(A)\),过点\(B\)的直线\(l_{2}\)与曲线\(D\)交于点\(N\),直线\(l_{1}\)与\(l_{2}\)倾斜角互补.
\(①\)直线\(MN\)的斜率是否为定值?若是,求出该定值;若不是,说明理由;
\(②\)设\(\triangle AMN\)与\(\triangle BMN\)的面积之和为\(S\),求\(S\)的取值范围.