feat(admin): ручные варианты UTM и независимый редактор config (#30)

admin/public/assets/admin.css

@@ -17,3 +17,5 @@
 .overview-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px;flex-wrap:wrap}.hidden-link{border:0;background:none;color:#52677c;text-decoration:underline;cursor:pointer;padding:6px 0}.domain-heading{display:flex;align-items:center;gap:7px}.domain-heading .overview-domain{margin:0;min-width:0;overflow-wrap:anywhere}.domain-grip,.domain-hide{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;border:0;background:transparent;color:#89949c;padding:3px;width:24px;height:24px;border-radius:4px}.domain-grip{cursor:grab;font-size:22px;touch-action:none}.domain-hide{cursor:pointer}.domain-grip:hover,.domain-hide:hover{background:#edf1f4;color:#40566b}.domain-hide:focus-visible,.domain-grip:focus-visible{outline:2px solid #337ab7}.domain-grip:disabled,.domain-hide:disabled{opacity:.4;cursor:wait}.hidden-domain-row{display:flex;align-items:center;gap:12px;padding:14px 0;border-bottom:1px solid #e2e7ec;flex-wrap:wrap}.domain-dragging{user-select:none;cursor:grabbing}.domain-drag-preview{position:fixed;z-index:1001;pointer-events:none;background:#fff;border:1px solid #9bb7cf;border-radius:6px;padding:12px;box-shadow:0 8px 24px #23394d30;opacity:.92}.domain-drag-preview>p,.domain-drag-preview>button{display:none}.domain-insertion{position:fixed;z-index:1000;pointer-events:none;width:3px;background:#337ab7}.hidden-domain-row .grow{min-width:180px}
 
 .matrix-read-at{font-size:11px;font-weight:400;margin:4px 0 8px;line-height:1.4}.matrix-variant-number{font-size:13px;padding:3px 5px}
+
+.matrix-add-variant{display:inline-flex;align-items:center;border:0;background:transparent;color:#337ab7;padding:8px 0 0;font-size:12px;cursor:pointer}.matrix-add-variant:hover{color:#23527c;text-decoration:underline}.matrix-add-variant:focus-visible{outline:2px solid #337ab7;outline-offset:3px}.matrix-add-variant:disabled{opacity:.5;cursor:default}.matrix-new-number{width:44px}.indpic-add-form{align-items:end}