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]/params.vue

@@ -0,0 +1,77 @@
+<template>
+  <div>
+    <div class="page-header">
+      <NuxtLink :to="`/admin/communes/${slug}`" style="color: var(--color-text-muted);">&larr; {{ slug }}</NuxtLink>
+      <h1>Paramètres tarifs</h1>
+    </div>
+
+    <div v-if="saved" class="alert alert-success">Paramètres enregistrés.</div>
+    <div v-if="error" class="alert alert-error">{{ error }}</div>
+
+    <div class="card" style="max-width: 600px;">
+      <form @submit.prevent="save">
+        <div class="form-group">
+          <label>Recettes cibles (€)</label>
+          <input v-model.number="form.recettes" type="number" class="form-input" step="1000" min="0" />
+        </div>
+        <div class="grid grid-2">
+          <div class="form-group">
+            <label>Abonnement RP/PRO (€)</label>
+            <input v-model.number="form.abop" type="number" class="form-input" step="1" min="0" />
+          </div>
+          <div class="form-group">
+            <label>Abonnement RS (€)</label>
+            <input v-model.number="form.abos" type="number" class="form-input" step="1" min="0" />
+          </div>
+        </div>
+        <div class="grid grid-2">
+          <div class="form-group">
+            <label>Prix max/m³ (€)</label>
+            <input v-model.number="form.pmax" type="number" class="form-input" step="0.5" min="0" />
+          </div>
+          <div class="form-group">
+            <label>Volume max (m³)</label>
+            <input v-model.number="form.vmax" type="number" class="form-input" step="100" min="0" />
+          </div>
+        </div>
+        <button type="submit" class="btn btn-primary" :disabled="loading">
+          Enregistrer
+        </button>
+      </form>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+definePageMeta({ middleware: 'admin' })
+
+const route = useRoute()
+const api = useApi()
+const slug = route.params.slug as string
+
+const form = reactive({ recettes: 75000, abop: 100, abos: 100, pmax: 20, vmax: 2100 })
+const loading = ref(false)
+const saved = ref(false)
+const error = ref('')
+
+onMounted(async () => {
+  try {
+    const params = await api.get<typeof form>(`/communes/${slug}/params`)
+    Object.assign(form, params)
+  } catch {}
+})
+
+async function save() {
+  loading.value = true
+  saved.value = false
+  error.value = ''
+  try {
+    await api.put(`/communes/${slug}/params`, form)
+    saved.value = true
+  } catch (e: any) {
+    error.value = e.message
+  } finally {
+    loading.value = false
+  }
+}
+</script>