feat: add /nodes route, AppSidebar nav item, and NodeManagementView

web/src/components/AppSidebar.vue

@@ -53,6 +53,17 @@
           <span v-if="!stowed" class="nav-label">Fleet</span>
         </RouterLink>
       </li>
+      <li>
+        <RouterLink
+          to="/nodes"
+          class="nav-item"
+          :title="stowed ? 'Nodes' : ''"
+          @click="isMobile && stow()"
+        >
+          <span class="nav-icon" aria-hidden="true">🖥️</span>
+          <span v-if="!stowed" class="nav-label">Nodes</span>
+        </RouterLink>
+      </li>
 
       <!-- ① Data section -->
       <li>

web/src/router/index.ts

@@ -12,12 +12,14 @@ const TrainJobsView    = () => import('../views/TrainJobsView.vue')
 const TrainResultsView = () => import('../views/TrainResultsView.vue')
 const ModelsView       = () => import('../views/ModelsView.vue')
 const SettingsView     = () => import('../views/SettingsView.vue')
+const NodeManagementView = () => import('../views/NodeManagementView.vue')
 
 export const routes = [
   // ── Top-level ────────────────────────────────────────────
   { path: '/',         component: DashboardView, meta: { title: 'Dashboard' } },
   { path: '/fleet',    component: ModelsView,    meta: { title: 'Fleet'     } },
   { path: '/settings', component: SettingsView,  meta: { title: 'Settings'  } },
+  { path: '/nodes',    component: NodeManagementView, meta: { title: 'Nodes' } },
 
   // ── Data domain ──────────────────────────────────────────
   { path: '/data/label',       component: LabelView,       meta: { title: 'Label'       } },

web/src/views/NodeManagementView.vue

@@ -0,0 +1,93 @@
+<script setup lang="ts">
+import { ref, onMounted } from 'vue'
+import NodeCard from '../components/nodes/NodeCard.vue'
+
+interface GpuEntry {
+  gpu_id: number
+  card: string
+  vram_total_mb: number
+  vram_used_mb: number
+  vram_free_mb: number
+  temp_c: number | null
+  utilization_pct: number | null
+  compute_cap: number | null
+  services_assigned: string[]
+  services_running: string[]
+}
+
+interface ServiceInfo {
+  min_compute_cap: number
+  max_mb: number
+  catalog_size: number
+}
+
+interface NodeSummary {
+  node_id: string
+  online: boolean
+  agent_url: string
+  gpus: GpuEntry[]
+  profile_loaded: boolean
+  services_catalog: Record<string, ServiceInfo>
+}
+
+const nodes = ref<NodeSummary[]>([])
+const loading = ref(true)
+const error = ref('')
+
+async function fetchNodes() {
+  loading.value = true
+  error.value = ''
+  try {
+    const r = await fetch('/api/nodes-mgmt/nodes')
+    if (!r.ok) throw new Error(`HTTP ${r.status}`)
+    nodes.value = await r.json()
+  } catch (e) {
+    error.value = e instanceof Error ? e.message : 'Failed to load nodes'
+  } finally {
+    loading.value = false
+  }
+}
+
+onMounted(fetchNodes)
+</script>
+
+<template>
+  <main class="nodes-page">
+    <header class="nodes-header">
+      <h1>Nodes</h1>
+      <button class="btn-secondary" @click="fetchNodes" :disabled="loading">Refresh</button>
+    </header>
+
+    <div v-if="loading" class="nodes-status" aria-live="polite">Loading nodes...</div>
+    <div v-else-if="error" class="nodes-status nodes-error" role="alert">{{ error }}</div>
+    <div v-else-if="nodes.length === 0" class="nodes-status">
+      No nodes found. Check <code>coordinator_url</code> in config.
+    </div>
+    <div v-else class="nodes-grid">
+      <NodeCard
+        v-for="node in nodes"
+        :key="node.node_id"
+        :node="node"
+        @updated="fetchNodes"
+      />
+    </div>
+  </main>
+</template>
+
+<style scoped>
+.nodes-page { padding: 1.5rem; }
+.nodes-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-bottom: 1.5rem;
+}
+.nodes-header h1 { margin: 0; font-size: 1.5rem; }
+.nodes-grid { display: flex; flex-direction: column; gap: 1.5rem; }
+.nodes-status {
+  color: var(--text-secondary, #888);
+  padding: 2rem;
+  text-align: center;
+}
+.nodes-error { color: var(--color-error, #fc8181); }
+</style>