feat(ekonomi): implement UMKM module with CRUD API and Dashboard analytics

MIND/SUMMARY/umkm-module-summary.md

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+# Summary: UMKM Module Implementation
+
+## Accomplishments
+- Successfully migrated the database to include `Umkm`, `ProdukUmkm`, and `PenjualanProduk` tables.
+- Implemented a complete set of CRUD API endpoints for UMKM, Products, and Sales.
+- Developed a comprehensive Dashboard API providing KPIs, sales summaries, top products, and detailed stock analytics.
+- Integrated the new module into the existing `ekonomi` router.
+- Verified the implementation with `tsc` to ensure type safety.
+
+## Files Created/Modified
+### Modified
+- `prisma/schema.prisma`: Added relations and models.
+- `src/app/api/[[...slugs]]/_lib/ekonomi/index.ts`: Registered new routers.
+
+### Created
+- `src/app/api/[[...slugs]]/_lib/ekonomi/umkm/`: CRUD for UMKM.
+- `src/app/api/[[...slugs]]/_lib/ekonomi/umkm/produk/`: CRUD for Products.
+- `src/app/api/[[...slugs]]/_lib/ekonomi/umkm/penjualan/`: CRUD for Sales with stock management.
+- `src/app/api/[[...slugs]]/_lib/ekonomi/umkm/dashboard/`: Analytics endpoints.
+
+## Stock Management Logic
+- Creating a sale decrements product stock.
+- Updating a sale adjusts stock based on the difference in quantity.
+- Deleting a sale increments stock back.
+
+## Next Steps
+- Implement frontend UI for the UMKM module.
+- Add more comprehensive tests for the stock management logic.