fix(footer): align template_1 shell with Zibll 1:1

Rewrite footer markup to zib_footer_con contract: single adaptive logo
(white-src/dark-src), fcode-links HTML primary, float third column,
hidden-xs, toggle-radius contacts, miniimg structure, customize-first
footer-conter. Restyle zibll-shell CSS and drop conflicting site-footer
BEM padding so filled footer data matches Zibll layout.

assets/css/frontend/footer/part-2.css

@@ -139,6 +139,7 @@ body.dark-theme #float-theme-toggle .float-btn__icon-sun {
     }
 
     /* 有 tabbar 时页脚需要额外底部间距 */
+    .footer,
     .site-footer {
         padding-bottom: calc(var(--aksrt-footer-tabbar-height) + env(safe-area-inset-bottom, 0px));
     }