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/middleware/admin.ts

@@ -0,0 +1,11 @@
+/**
+ * Route middleware: redirects to login if user is not an admin.
+ * Apply via definePageMeta({ middleware: 'admin' }) on admin pages.
+ */
+export default defineNuxtRouteMiddleware((to) => {
+  const authStore = useAuthStore()
+
+  if (!authStore.isAuthenticated || !authStore.isAdmin) {
+    return navigateTo('/login')
+  }
+})