已知数列\(\{a _{n} \}\)，其前\(n\)项和\(S_{n}=n^{2}\)，\(a _{1}\)，\(a _{2}\)，\(a _{5}\)是等比数列\(\{b _{n} \}\)的前三项．
\((\)Ⅰ\()\)求数列\(\{a _{n} \}\)，\(\{b _{n} \}\)的通项公式；
\((\)Ⅱ\()\)若\(c _{n} =a _{n} b _{n}\)，求数列\(\{c _{n} \}\)前\(n\)项和\(T _{n}\)．