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>

Makefile

@@ -0,0 +1,29 @@
+.PHONY: install dev dev-backend dev-frontend test seed docker-up docker-down
+
+# ── Development ──
+
+install:
+	cd backend && python3 -m venv venv && . venv/bin/activate && pip install -r requirements.txt
+	cd frontend && npm install
+
+dev: dev-backend dev-frontend
+
+dev-backend:
+	cd backend && . venv/bin/activate && uvicorn app.main:app --reload --port 8000
+
+dev-frontend:
+	cd frontend && npm run dev
+
+test:
+	cd backend && . venv/bin/activate && python -m pytest tests/ -v
+
+seed:
+	cd backend && . venv/bin/activate && python seed.py
+
+# ── Docker ──
+
+docker-up:
+	docker compose up --build -d
+
+docker-down:
+	docker compose down