[frontend-gray] support grayKey from localStorage

[heimanba]

Ⅰ. [feature] support grayKey from localStorage

II. [bugfix] CDN的前缀路径匹配，按照优先匹配到长的路由

匹配规则如下：

{
		"/":       "/{version}/index.html",
		"/sta":    "/sta/{version}/index.html",
		"/static": "/static/{version}/index.html",
}

请求路由以及匹配的文件为：

{"/static123", "/static/v1.0.0/index.html"},
{"/static", "/static/v1.0.0/index.html"},
{"/sta", "/sta/v1.0.0/index.html"},
{"/", "/v1.0.0/index.html"},