feat(ui): ReplyPier 品牌、中文界面与前端构建产物

替换品牌文案与图标，补齐窄屏布局和加载失败提示，确认主要旅程可操作。

frontend/src/assets/config.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0,0,256,256" width="50px" height="50px" fill-rule="nonzero"><g fill="#000000" fill-rule="nonzero" stroke="none" stroke-width="1" stroke-linecap="butt" stroke-linejoin="miter" stroke-miterlimit="10" stroke-dasharray="" stroke-dashoffset="0" font-family="none" font-weight="none" font-size="none" text-anchor="none" style="mix-blend-mode: normal"><g transform="scale(5.12,5.12)"><path d="M41.5,0c-4.68248,0 -8.5,3.81752 -8.5,8.5c0,0.98423 0.29088,1.87869 0.59961,2.75586l-7.53516,7.5332c-1.41239,1.41239 -1.41239,3.73214 0,5.14453c1.41239,1.41239 3.7341,1.41239 5.14648,0l7.53125,-7.5332c0.8779,0.30938 1.77344,0.59961 2.75781,0.59961c4.68248,0 8.5,-3.81752 8.5,-8.5c0,-0.93143 -0.15402,-1.82719 -0.42969,-2.66211l-0.49609,-1.50195l-1.14453,1.09375l-4.66211,4.45313l-2.45703,-0.69336l-0.69336,-2.45703l5.54687,-5.80859l-1.50391,-0.49414c-0.83396,-0.27422 -1.72872,-0.42969 -2.66016,-0.42969zM41.5,2c0.11179,0 0.21006,0.04507 0.32031,0.05078l-3.9375,4.125l1.30664,4.63477l4.63281,1.30664l4.125,-3.93945c0.00579,0.11102 0.05273,0.20972 0.05273,0.32227c0,3.60152 -2.89848,6.5 -6.5,6.5c-0.95719,0 -1.85793,-0.21152 -2.68164,-0.58594l-0.63086,-0.28711l-8.39258,8.39258c-0.64761,0.64761 -1.66879,0.64761 -2.31641,0c-0.64761,-0.64761 -0.64761,-1.66879 0,-2.31641l8.39258,-8.39062l-0.28711,-0.63086c-0.37353,-0.82282 -0.58398,-1.72445 -0.58398,-2.68164c0,-3.60152 2.89848,-6.5 6.5,-6.5zM8,8c-2.206,0 -4,1.794 -4,4v22c0,0.73222 0.21188,1.4091 0.55664,2h-2.55664c-0.55226,0.00006 -0.99994,0.44774 -1,1c0,2.74952 2.25048,5 5,5h38c2.74952,0 5,-2.25048 5,-5c-0.00006,-0.55226 -0.44774,-0.99994 -1,-1h-2.55664c0.34476,-0.5909 0.55664,-1.26778 0.55664,-2v-16.02344c-0.635,0.302 -1.303,0.53994 -2,0.71094v15.3125c0,1.103 -0.897,2 -2,2h-34c-1.103,0 -2,-0.897 -2,-2v-22c0,-1.103 0.897,-2 2,-2h23.11914c-0.07,-0.491 -0.11914,-0.989 -0.11914,-1.5c0,-0.169 0.01739,-0.333 0.02539,-0.5zM3.41211,38h4.58789h34h4.58789c-0.43709,1.11247 -1.31204,2 -2.58789,2h-38c-1.27585,0 -2.1508,-0.88753 -2.58789,-2z"></path></g></g></svg>