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

MIND/PLAN/umkm-module.md

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+# Plan: UMKM Module Implementation
+
+## Goal
+Implement UMKM, ProdukUmkm, and PenjualanProduk module with CRUD API and Dashboard analytics.
+
+## Steps
+1. Update Prisma Schema (already done in file).
+2. Run database migration and seed data.
+3. Implement UMKM CRUD API.
+4. Implement ProdukUmkm CRUD API.
+5. Implement PenjualanProduk CRUD API.
+6. Implement Dashboard API (KPI, Summary, Top Produk, Detail Penjualan).
+7. Register all routers in the ekonomi module.
+8. Verify with type check and build.
+
+## Progress
+- [x] Step 1: Update Prisma Schema
+- [x] Step 2: Run database migration
+- [x] Step 3: Implement UMKM CRUD API
+- [x] Step 4: Implement ProdukUmkm CRUD API
+- [x] Step 5: Implement PenjualanProduk CRUD API
+- [x] Step 6: Implement Dashboard API
+- [x] Step 7: Register routers
+- [x] Step 8: Verify changes

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.