add-backend

Everything about the data layer — pick one of six ready-to-run backend templates (TanStack Start + Drizzle + better-auth, Hono + Drizzle + better-auth, Hono + Prisma + better-auth, Hono + Drizzle + Auth.js/NextAuth, FastAPI + SQLAlchemy + JWT, Supabase) and wire the frontend to it through the Repository + AuthProvider seams; scaffold a CRUD resource (Postgres table + server fns + query hooks + DataTable page + create/edit dialog + sidebar entry); bind or swap one resource's data source (Drizzle / REST / GraphQL / in-memory); or re-point the whole app's data + auth at a different backend. Use when adding a data entity or pointing the app at a backend other than the default Postgres + better-auth.