web: unify Agent management and add a draggable link board

Replace Probe pages with directed Agent links, shared deployment controls and unified display data. Add node dragging, canvas pan and zoom, saved layouts, and per-direction link controls.

web/admin/src/App.tsx

@@ -11,8 +11,7 @@ import { PasskeyNotice } from './PasskeyNotice'
 import { Setup } from './Setup'
 import { AgentDetail } from './pages/AgentDetail'
 import { Agents } from './pages/Agents'
-import { Probes } from './pages/Probes'
-import { ProbeDetail } from './pages/ProbeDetail'
+import { Links } from './pages/Links'
 import { System } from './pages/System'
 import { Tasks } from './pages/Tasks'
 import { Tests } from './pages/Tests'
@@ -228,7 +227,7 @@ function Login() {
 }
 
 const NAV = [
-  { section: '运维', items: [{ to: '/agents', label: 'Agent', icon: Server }, { to: '/probes', label: 'Probe', icon: Radar }] },
+  { section: '运维', items: [{ to: '/agents', label: 'Agent', icon: Server }, { to: '/links', label: '线路画板', icon: Radar }] },
   { section: '测试', items: [{ to: '/tasks', label: '任务', icon: ListChecks }, { to: '/tests', label: '按需测试', icon: FlaskConical }] },
   { section: '系统', items: [{ to: '/system', label: '系统', icon: Settings }] },
 ]
@@ -286,8 +285,7 @@ export function App() {
           <Route path="/" element={<Navigate to="/agents" replace />} />
           <Route path="/agents" element={<Agents />} />
           <Route path="/agents/:id" element={<AgentDetail />} />
-          <Route path="/probes" element={<Probes />} />
-          <Route path="/probes/:id" element={<ProbeDetail />} />
+          <Route path="/links" element={<Links />} />
           <Route path="/tasks" element={<Tasks />} />
           <Route path="/tests" element={<Tests />} />
           <Route path="/system" element={<System />} />