feat(ekonomi): refactor umkm module with sales delete, stock validation, and ordering system

.claude/ARCHITECTURE.md

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+# Architecture
+
+## Tech Stack
+- **Framework**: Next.js 15 (App Router) + React 19
+- **Runtime/Package manager**: Bun (not npm)
+- **API server**: Elysia.js (mounted at `/api/[[...slugs]]`)
+- **ORM**: Prisma + PostgreSQL
+- **UI**: Mantine UI v7-8
+- **State**: Jotai (atoms), Valtio (proxies), SWR (data fetching)
+- **Auth**: iron-session + JWT
+- **File storage**: Local uploads + Seafile (self-hosted)
+
+## Request Flow
+
+```
+Browser → Next.js middleware (src/middleware.ts)
+       → Public pages: src/app/darmasaba/
+       → Admin pages:  src/app/admin/
+       → API:          src/app/api/[[...slugs]]/route.ts (Elysia.js)
+                       └── _lib/*.ts  (domain modules)
+```
+
+The Elysia server is a single entry point with domain-specific modules: `desa.ts`, `kesehatan.ts`, `ekonomi.ts`, `keamanan.ts`, `lingkungan.ts`, `pendidikan.ts`, `kependudukan.ts`, `ppid.ts`, `inovasi.ts`, `auth/`, `user/`, `fileStorage/`. Swagger docs are auto-generated at `/api/docs`.
+
+## Domain Modules
+Each domain (desa, kesehatan, ekonomi, etc.) has:
+- API handler in `src/app/api/[[...slugs]]/_lib/<domain>.ts`
+- Admin CMS pages in `src/app/admin/(dashboard)/<domain>/`
+- Public pages in `src/app/darmasaba/(pages)/<domain>/`
+
+## Key Files
+
+| File | Purpose |
+|------|---------|
+| `src/middleware.ts` | Route guards and auth |
+| `src/lib/prisma.ts` | Prisma client singleton |
+| `src/lib/api-auth.ts` | JWT/session validation |
+| `src/lib/api-fetch.ts` | Typed fetch wrapper used by frontend |
+| `src/lib/session.ts` | iron-session config |
+| `next.config.ts` | Next.js config (cache headers, allowed origins) |
+| `postcss.config.cjs` | Mantine CSS preset and breakpoints |
+| `docker-entrypoint.sh` | Runs `prisma migrate deploy` then starts app |