fix(frontend): 侧边栏滚动失效与 Jenkins 图标本地化

- ScrollArea 增加 min-h-0，修复 flex 子项不收缩导致导航超屏无法滚动
- Jenkins 品牌图标替换 simple-icons 单色红为仓库本地官方多色 SVG

frontend/public/icons/jenkins.svg

@@ -0,0 +1 @@
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frontend/src/components/icons/TechnologyBrandIcon.tsx

@@ -4,7 +4,6 @@ import {
   siDocker,
   siElasticsearch,
   siGrafana,
-  siJenkins,
   siKubernetes,
   siPrometheus,
 } from 'simple-icons';
@@ -13,12 +12,17 @@ const ICONS = {
   docker: siDocker,
   elasticsearch: siElasticsearch,
   grafana: siGrafana,
-  jenkins: siJenkins,
   kubernetes: siKubernetes,
   prometheus: siPrometheus,
 } satisfies Record<string, SimpleIcon>;
 
-export type TechnologyBrand = keyof typeof ICONS;
+// Jenkins 使用仓库本地官方多色 SVG（public/icons/jenkins.svg），
+// 替换 simple-icons 的单色红色版本。 // Logan.Li
+const LOCAL_SVG: Partial<Record<keyof typeof ICONS | 'jenkins', string>> = {
+  jenkins: '/icons/jenkins.svg',
+};
+
+export type TechnologyBrand = keyof typeof ICONS | 'jenkins';
 
 interface TechnologyBrandIconProps {
   brand: TechnologyBrand;
@@ -31,7 +35,20 @@ export function TechnologyBrandIcon({
   className = 'h-5 w-5',
   title,
 }: TechnologyBrandIconProps) {
-  const icon = ICONS[brand];
+  const localSrc = LOCAL_SVG[brand];
+  if (localSrc) {
+    return (
+      <img
+        src={localSrc}
+        alt={title || 'Jenkins'}
+        aria-label={title}
+        role="img"
+        className={className}
+      />
+    );
+  }
+
+  const icon: SimpleIcon = ICONS[brand as keyof typeof ICONS];
   const label = title || icon.title;
 
   return (

frontend/src/components/layout/Sidebar.tsx

@@ -415,7 +415,8 @@ export function Sidebar({ mobileOpen, onMobileClose }: SidebarProps) {
       </div>
 
       {/* Menu Items */}
-      <ScrollArea className="flex-1 py-2 px-1.5">
+      {/* min-h-0 允许 flex 子项收缩，否则导航超出高度时 ScrollArea 不会出现滚动 // Logan.Li */}
+      <ScrollArea className="flex-1 min-h-0 py-2 px-1.5">
         <nav className="space-y-0.5">
           {visibleMenuItems.map((item) => (
             <MenuItemComponent