feat: add stage 0 foundation

docs/development/local-setup.md

@@ -0,0 +1,41 @@
+# Local Setup
+
+## Prerequisites
+
+- Python 3.12
+- Node.js 22
+- Docker Desktop
+
+## First Run
+
+```bash
+copy .env.example .env
+cd infra
+docker compose --env-file ../.env up --build
+```
+
+Backend:
+
+- API: http://localhost:8000/api/docs
+- Health: http://localhost:8000/api/system/health
+
+Frontend:
+
+- App: http://localhost:5173
+
+## Backend Tests
+
+```bash
+cd backend
+python -m pip install -e ".[dev]"
+pytest -v
+```
+
+## Frontend Checks
+
+```bash
+cd frontend
+npm install
+npm run typecheck
+npm run build
+```