feat: 「查看接口」改为站内路由，只换右侧内容

- ServicePanel 新增 onOpenApi，链接点击接管为 navigate('/interface')；
  按住 Ctrl/Cmd/Shift/Alt 仍保留新标签打开
- 前台内容区已有 route.kind === 'api' 分支，直接渲染接口一览
- 顺手删掉两个没人引用的旧组件：sidebar/Sidebar.tsx、sidebar/CategoryNav.tsx

stash-web/src/components/sidebar/ServicePanel.tsx

@@ -10,9 +10,17 @@ type ServicePanelProps = {
   live: boolean
   refreshing: boolean
   onRefresh: () => void
+  /** 打开接口一览：走站内路由，不整页刷新 */
+  onOpenApi: () => void
 }
 
-export function ServicePanel({ projects, live, refreshing, onRefresh }: ServicePanelProps) {
+export function ServicePanel({
+  projects,
+  live,
+  refreshing,
+  onRefresh,
+  onOpenApi,
+}: ServicePanelProps) {
   const host = typeof window === 'undefined' ? '-' : window.location.host
 
   return (
@@ -56,7 +64,16 @@ export function ServicePanel({ projects, live, refreshing, onRefresh }: ServiceP
           重新扫描
         </Button>
 
-        <a className="link-button" href="/interface">
+        <a
+          className="link-button"
+          href="/interface"
+          onClick={(event) => {
+            // 无修饰键时接管点击，走站内路由，只换右侧内容；按住修饰键仍可新标签打开
+            if (event.metaKey || event.ctrlKey || event.shiftKey || event.altKey) return
+            event.preventDefault()
+            onOpenApi()
+          }}
+        >
           <Icon name="link_3_line" />
           查看接口
         </a>