feat(settings): Routstr AI budget panel — the integration's missing switch

The Routstr backend (Cashu-paid inference fallback, shipped 1.7.127) was
fully wired but permanently dormant: its D-05 gate requires an
operator-set sats allowance and nothing in the UI ever called
assistant.budget-get/set — default 0 meant never selected. New Settings
panel (below AI Data Access): allowance/spent/remaining, set-allowance
with 0-disables semantics, enabled/off badge. Backend untouched.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

neode-ui/src/views/settings/RoutstrBudgetSection.vue

@@ -0,0 +1,112 @@
+<script setup lang="ts">
+import { ref, onMounted, computed } from 'vue'
+import { rpcClient } from '@/api/rpc-client'
+
+// Routstr prepaid budget (D-05): the assistant may only spend against an
+// operator-set sats ceiling. Zero allowance = Routstr never selected. This
+// panel is the ONLY UI for that ceiling; it fronts assistant.budget-get/set.
+const loaded = ref(false)
+const allowance = ref(0)
+const spent = ref(0)
+const remaining = ref(0)
+const draft = ref('')
+const applying = ref(false)
+const error = ref('')
+const savedTick = ref(false)
+
+const active = computed(() => allowance.value > 0)
+
+async function refresh() {
+  const res = await rpcClient.call<{ allowance_sats: number; spent_sats: number; remaining_sats: number }>({
+    method: 'assistant.budget-get',
+  })
+  allowance.value = res.allowance_sats
+  spent.value = res.spent_sats
+  remaining.value = res.remaining_sats
+  draft.value = String(res.allowance_sats)
+}
+
+onMounted(async () => {
+  try {
+    await refresh()
+    loaded.value = true
+  } catch { /* backend without the RPC — section hides */ }
+})
+
+async function apply() {
+  const parsed = Number(draft.value)
+  if (!Number.isInteger(parsed) || parsed < 0) {
+    error.value = 'Enter a whole number of sats (0 disables Routstr).'
+    return
+  }
+  applying.value = true
+  error.value = ''
+  try {
+    await rpcClient.call({ method: 'assistant.budget-set', params: { allowance_sats: parsed } })
+    await refresh()
+    savedTick.value = true
+    setTimeout(() => { savedTick.value = false }, 2500)
+  } catch (e: unknown) {
+    error.value = e instanceof Error ? e.message : 'Failed to save budget'
+  } finally {
+    applying.value = false
+  }
+}
+</script>
+
+<template>
+  <div v-if="loaded" class="glass-card px-6 py-6 mb-6">
+    <div class="flex items-center gap-3 mb-2">
+      <h2 class="text-xl font-semibold text-white/96">Routstr AI Budget</h2>
+      <span
+        class="text-xs font-mono px-2 py-0.5 rounded"
+        :class="active ? 'bg-emerald-500/20 text-emerald-300' : 'bg-white/10 text-white/50'"
+      >{{ active ? 'enabled' : 'off' }}</span>
+    </div>
+    <p class="text-sm text-white/60 mb-5">
+      Routstr is pay-per-use AI inference, paid in sats over Cashu, used when your local
+      model can't take a request. It never spends without a prepaid ceiling you set here —
+      at <span class="font-mono">0</span> it is completely disabled. The assistant stops
+      when the ceiling is reached; raising it widens the remainder without erasing the
+      spend history.
+    </p>
+
+    <div class="grid grid-cols-3 gap-4 mb-5 text-center">
+      <div class="rounded-lg bg-white/5 py-3">
+        <div class="text-lg font-mono text-white/90">{{ allowance.toLocaleString() }}</div>
+        <div class="text-xs text-white/50 mt-1">Allowance (sats)</div>
+      </div>
+      <div class="rounded-lg bg-white/5 py-3">
+        <div class="text-lg font-mono text-white/90">{{ spent.toLocaleString() }}</div>
+        <div class="text-xs text-white/50 mt-1">Spent</div>
+      </div>
+      <div class="rounded-lg bg-white/5 py-3">
+        <div class="text-lg font-mono" :class="remaining > 0 ? 'text-emerald-300' : 'text-white/60'">{{ remaining.toLocaleString() }}</div>
+        <div class="text-xs text-white/50 mt-1">Remaining</div>
+      </div>
+    </div>
+
+    <div class="flex items-end gap-3">
+      <div class="flex-1 max-w-xs">
+        <label class="block text-sm text-white/60 mb-1" for="routstr-allowance">Set allowance (sats)</label>
+        <input
+          id="routstr-allowance"
+          v-model="draft"
+          type="number"
+          min="0"
+          step="1"
+          inputmode="numeric"
+          class="w-full bg-white/5 border border-white/10 rounded-lg px-4 py-2.5 text-sm text-white font-mono placeholder-white/30 focus:outline-none focus:border-white/30 transition-colors"
+          @keydown.enter="apply"
+        />
+      </div>
+      <button
+        :disabled="applying || draft === String(allowance)"
+        @click="apply"
+        class="px-4 py-2 glass-button rounded-lg text-sm font-medium disabled:opacity-50"
+      >{{ applying ? 'Saving…' : 'Save' }}</button>
+      <span v-if="savedTick" class="text-sm text-emerald-300 pb-2">Saved</span>
+    </div>
+    <div v-if="error" class="mt-3 alert-error text-sm">{{ error }}</div>
+  </div>
+</template>

neode-ui/src/views/settings/SystemSection.vue

@@ -3,6 +3,7 @@ import InterfaceModeSection from '@/views/settings/InterfaceModeSection.vue'
 import KioskDisplaySection from '@/views/settings/KioskDisplaySection.vue'
 import ClaudeAuthSection from '@/views/settings/ClaudeAuthSection.vue'
 import AIDataAccessSection from '@/views/settings/AIDataAccessSection.vue'
+import RoutstrBudgetSection from '@/views/settings/RoutstrBudgetSection.vue'
 import WebhookSection from '@/views/settings/WebhookSection.vue'
 import TelemetrySection from '@/views/settings/TelemetrySection.vue'
 import NodeCertificateSection from '@/views/settings/NodeCertificateSection.vue'
@@ -16,6 +17,7 @@ import SystemDangerZone from '@/views/settings/SystemDangerZone.vue'
   <KioskDisplaySection />
   <ClaudeAuthSection />
   <AIDataAccessSection />
+  <RoutstrBudgetSection />
   <WebhookSection />
   <TelemetrySection />
   <NodeCertificateSection />