chore: initial project setup with backend, frontend, and infrastructure

Add complete NexaPantry application structure including:
- Docker Compose configuration with PostgreSQL, Redis, FastAPI backend, worker, frontend and Caddy
- Environment configuration template with database, auth, and service settings
- GitHub Actions CI workflow for backend/frontend linting, testing, auditing and Docker builds
- AGPL-3.0 license and comprehensive README with setup, development, and security documentation
- Backend

backend/app/api/router.py

@@ -0,0 +1,14 @@
+from fastapi import APIRouter
+
+from app.api.routes import admin, auth, homes, notifications, products, recipes, setup, shopping
+
+api_router = APIRouter()
+api_router.include_router(setup.router, prefix="/setup", tags=["setup"])
+api_router.include_router(auth.router, prefix="/auth", tags=["auth"])
+api_router.include_router(admin.router, prefix="/admin", tags=["admin"])
+api_router.include_router(homes.router, prefix="/homes", tags=["homes"])
+api_router.include_router(products.router, prefix="/homes/{home_id}/products", tags=["products"])
+api_router.include_router(shopping.router, prefix="/homes/{home_id}/shopping", tags=["shopping"])
+api_router.include_router(notifications.router, prefix="/notifications", tags=["notifications"])
+api_router.include_router(recipes.router, prefix="/homes/{home_id}/recipes", tags=["recipes"])
+