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/commune/[slug]/citizen.vue

@@ -0,0 +1,11 @@
+<template>
+  <div></div>
+</template>
+
+<script setup lang="ts">
+// Redirect to main commune page (editor is now integrated there)
+const route = useRoute()
+const router = useRouter()
+const slug = route.params.slug as string
+onMounted(() => router.replace(`/commune/${slug}`))
+</script>