feat: 排行榜不再展示任何IP，用户列显示地区（ip2region v4 离线库）+浏览器（UA解析）；IP仅后台保存，页面上方显示IP+地区

go.sum

@@ -42,6 +42,8 @@ github.com/klauspost/cpuid/v2 v2.3.0 h1:S4CRMLnYUhGeDFDqkGriYKdfoFlDnMtqTiI/sFzh
 github.com/klauspost/cpuid/v2 v2.3.0/go.mod h1:hqwkgyIinND0mEev00jJYCxPNVRVXFQeu1XKlok6oO0=
 github.com/leodido/go-urn v1.4.0 h1:WT9HwE9SGECu3lg4d/dIA+jxlljEa1/ffXKmRjqdmIQ=
 github.com/leodido/go-urn v1.4.0/go.mod h1:bvxc+MVxLKB4z00jd1z+Dvzr47oO32F/QSNjSBOlFxI=
+github.com/lionsoul2014/ip2region/binding/golang v0.0.0-20260814054437-800d19424237 h1:MnELyo/XfIhNDG7YjVUHkEW0CsgONASbV7SWqVL6/gw=
+github.com/lionsoul2014/ip2region/binding/golang v0.0.0-20260814054437-800d19424237/go.mod h1:sj5LMpsqB4IWdwIrcmmBJM6m+rW/uOQLSGUPhKkqdh8=
 github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
 github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
 github.com/mattn/go-sqlite3 v1.14.22 h1:2gZY6PC6kBnID23Tichd1K+Z0oS6nE/XwU+Vz/5o4kU=