Initial commit: SejeteralO water tarification platform

Full-stack app for participatory water pricing using Bezier curves.
- Backend: FastAPI + SQLAlchemy + SQLite with JWT auth
- Frontend: Nuxt 4 + TypeScript with interactive SVG editor
- Math engine: cubic Bezier tarification with Cardano solver
- Admin: commune management, household import, vote monitoring, CMS
- Citizen: interactive curve editor, vote submission
- Docker-compose deployment ready

Includes fixes for:
- Impact table snake_case/camelCase property mismatch
- CMS content backend API + frontend editor (was stub)
- Admin route protection middleware
- Public content display on commune page
- Vote confirmation page link fix

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/app/pages/admin/communes/[slug]/import.vue

@@ -0,0 +1,111 @@
+<template>
+  <div>
+    <div class="page-header">
+      <NuxtLink :to="`/admin/communes/${slug}`" style="color: var(--color-text-muted);">&larr; {{ slug }}</NuxtLink>
+      <h1>Import des foyers</h1>
+    </div>
+
+    <div class="card" style="max-width: 700px;">
+      <p style="margin-bottom: 1rem;">
+        Importez un fichier CSV ou XLSX avec les colonnes :
+        <code>identifier, status, volume_m3, price_eur</code>
+      </p>
+
+      <a :href="`${apiBase}/communes/${slug}/households/template`" class="btn btn-secondary" style="margin-bottom: 1rem;">
+        Télécharger le template
+      </a>
+
+      <div class="form-group">
+        <label>Fichier (CSV ou XLSX)</label>
+        <input type="file" accept=".csv,.xlsx,.xls" @change="onFileChange" class="form-input" />
+      </div>
+
+      <!-- Preview -->
+      <div v-if="preview" style="margin: 1rem 0;">
+        <div v-if="preview.errors.length" class="alert alert-error">
+          <strong>Erreurs :</strong>
+          <ul style="margin: 0.5rem 0 0 1rem;">
+            <li v-for="err in preview.errors" :key="err">{{ err }}</li>
+          </ul>
+        </div>
+        <div v-else class="alert alert-success">
+          {{ preview.valid_rows }} foyers valides prêts à importer.
+        </div>
+      </div>
+
+      <!-- Result -->
+      <div v-if="result" class="alert alert-success">
+        {{ result.created }} foyers importés.
+        <span v-if="result.errors.length"> ({{ result.errors.length }} avertissements)</span>
+      </div>
+
+      <div style="display: flex; gap: 0.5rem;">
+        <button
+          class="btn btn-secondary"
+          :disabled="!file || previewLoading"
+          @click="doPreview"
+        >
+          Vérifier
+        </button>
+        <button
+          class="btn btn-primary"
+          :disabled="!file || importLoading || (preview && preview.errors.length > 0)"
+          @click="doImport"
+        >
+          Importer
+        </button>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+definePageMeta({ middleware: 'admin' })
+
+const route = useRoute()
+const config = useRuntimeConfig()
+const api = useApi()
+const slug = route.params.slug as string
+const apiBase = config.public.apiBase as string
+
+const file = ref<File | null>(null)
+const preview = ref<any>(null)
+const result = ref<any>(null)
+const previewLoading = ref(false)
+const importLoading = ref(false)
+
+function onFileChange(e: Event) {
+  const input = e.target as HTMLInputElement
+  file.value = input.files?.[0] || null
+  preview.value = null
+  result.value = null
+}
+
+async function doPreview() {
+  if (!file.value) return
+  previewLoading.value = true
+  const fd = new FormData()
+  fd.append('file', file.value)
+  try {
+    preview.value = await api.post(`/communes/${slug}/households/import/preview`, fd)
+  } catch (e: any) {
+    preview.value = { valid_rows: 0, errors: [e.message], sample: [] }
+  } finally {
+    previewLoading.value = false
+  }
+}
+
+async function doImport() {
+  if (!file.value) return
+  importLoading.value = true
+  const fd = new FormData()
+  fd.append('file', file.value)
+  try {
+    result.value = await api.post(`/communes/${slug}/households/import`, fd)
+  } catch (e: any) {
+    result.value = { created: 0, errors: [e.message] }
+  } finally {
+    importLoading.value = false
+  }
+}
+</script>