feat: initial brainstorming app — Nuxt 3 + SQLite + admin auth

Nuxt 3 app with:
- SQLite (better-sqlite3) for persistence
- Anonymous idea submission and voting
- Admin auth with session cookies
- AI analysis via Gemini API
- Nuxt UI components + Tailwind

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/pages/admin.vue

@@ -0,0 +1,143 @@
+<script setup lang="ts">
+const { admin, logout } = useAuth()
+const toast = useToast()
+const analysisKey = ref('')
+const analysis = ref<any>(null)
+const analyzing = ref(false)
+
+const { data: ideas, refresh } = useFetch<any[]>('/api/ideas')
+
+watch(admin, (v) => {
+  if (!v) navigateTo('/login')
+}, { immediate: true })
+
+async function deleteIdea(id: number) {
+  await $fetch(`/api/ideas/${id}`, { method: 'DELETE' })
+  toast.add({ title: 'Idea eliminada', color: 'success' })
+  refresh()
+}
+
+async function toggleHide(idea: any) {
+  await $fetch(`/api/ideas/${idea.id}`, {
+    method: 'PATCH',
+    body: { hidden: !idea.hidden },
+  })
+  refresh()
+}
+
+async function analyze() {
+  if (!analysisKey.value) {
+    toast.add({ title: 'Introduce la API key de Gemini', color: 'warning' })
+    return
+  }
+  analyzing.value = true
+  try {
+    analysis.value = await $fetch('/api/analysis', {
+      method: 'POST',
+      body: { apiKey: analysisKey.value },
+    })
+  } catch (e: any) {
+    toast.add({ title: e.data?.message || 'Error en análisis', color: 'error' })
+  } finally {
+    analyzing.value = false
+  }
+}
+
+async function doLogout() {
+  await logout()
+  navigateTo('/')
+}
+</script>
+
+<template>
+  <div class="min-h-screen bg-neutral-50 p-4 md:p-8">
+    <header class="max-w-5xl mx-auto flex items-center justify-between mb-8">
+      <div>
+        <h1 class="text-2xl font-bold">Panel de Administración</h1>
+        <p class="text-neutral-500 text-sm">Gestiona ideas y genera análisis IA.</p>
+      </div>
+      <div class="flex gap-2">
+        <NuxtLink to="/">
+          <UButton variant="ghost">Ver tablón</UButton>
+        </NuxtLink>
+        <UButton color="error" variant="soft" @click="doLogout">Cerrar sesión</UButton>
+      </div>
+    </header>
+
+    <main class="max-w-5xl mx-auto grid grid-cols-1 lg:grid-cols-3 gap-8">
+      <!-- AI Analysis -->
+      <div class="lg:col-span-1 space-y-4">
+        <UCard>
+          <template #header>
+            <h2 class="font-semibold">Análisis IA</h2>
+          </template>
+          <div class="space-y-3">
+            <UFormField label="Gemini API Key">
+              <UInput v-model="analysisKey" type="password" placeholder="AIza..." />
+            </UFormField>
+            <UButton block :loading="analyzing" :disabled="analyzing" @click="analyze">
+              Generar Análisis
+            </UButton>
+          </div>
+        </UCard>
+
+        <UCard v-if="analysis">
+          <template #header>
+            <h3 class="font-semibold">Resultados</h3>
+          </template>
+          <div class="space-y-4 text-sm">
+            <div>
+              <h4 class="font-bold text-primary mb-1">Fricción Principal</h4>
+              <ul class="space-y-1 text-neutral-600">
+                <li v-for="(p, i) in analysis.topFrictionPoints" :key="i">• {{ p }}</li>
+              </ul>
+            </div>
+            <div>
+              <h4 class="font-bold text-amber-600 mb-1">Quick Wins</h4>
+              <ul class="space-y-1 text-neutral-600">
+                <li v-for="(w, i) in analysis.quickWins" :key="i">• {{ w }}</li>
+              </ul>
+            </div>
+            <div>
+              <h4 class="font-bold text-neutral-500 mb-1">Visión Estratégica</h4>
+              <p class="text-neutral-500 italic">{{ analysis.strategicAdvice }}</p>
+            </div>
+          </div>
+        </UCard>
+      </div>
+
+      <!-- Ideas management -->
+      <div class="lg:col-span-2">
+        <h2 class="text-lg font-bold mb-4">Todas las ideas ({{ ideas?.length ?? 0 }})</h2>
+        <div class="space-y-3">
+          <UCard v-for="idea in ideas" :key="idea.id" :class="{ 'opacity-50': idea.hidden }">
+            <div class="flex justify-between items-start">
+              <div class="flex-1">
+                <div class="flex items-center gap-2 mb-2">
+                  <UBadge color="primary" variant="subtle" size="xs">{{ idea.category }}</UBadge>
+                  <UBadge v-if="idea.hidden" color="warning" variant="subtle" size="xs">Oculta</UBadge>
+                  <span class="text-xs text-neutral-400">{{ new Date(idea.created_at).toLocaleString() }}</span>
+                  <UBadge color="neutral" size="xs">{{ idea.votes }} votos</UBadge>
+                </div>
+                <p class="text-sm">{{ idea.text }}</p>
+              </div>
+              <div class="flex gap-1 ml-4 shrink-0">
+                <UButton
+                  variant="ghost"
+                  size="xs"
+                  :color="idea.hidden ? 'success' : 'warning'"
+                  @click="toggleHide(idea)"
+                >
+                  {{ idea.hidden ? 'Mostrar' : 'Ocultar' }}
+                </UButton>
+                <UButton variant="ghost" size="xs" color="error" @click="deleteIdea(idea.id)">
+                  Borrar
+                </UButton>
+              </div>
+            </div>
+          </UCard>
+        </div>
+      </div>
+    </main>
+  </div>
+</template>