fix: rename DistribusiUmur.kelompok to rentangUmur to match UI/API

- Update Prisma schema: kelompok -> rentangUmur
- Update seed data JSON: kelompok -> rentangUmur
- Update seeder file: use rentangUmur field
- This fixes the empty data issue in distribusi-umur admin page

Note: Run 'bunx prisma db push' to apply schema migration

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

prisma/data/kependudukan/distribusi-umur/distribusi-umur.json

@@ -1,31 +1,31 @@
 [
   {
     "id": "cmk-umur-001",
-    "kelompok": "0-14",
+    "rentangUmur": "0-14",
     "jumlah": 820,
     "tahun": 2026
   },
   {
     "id": "cmk-umur-002",
-    "kelompok": "15-24",
+    "rentangUmur": "15-24",
     "jumlah": 650,
     "tahun": 2026
   },
   {
     "id": "cmk-umur-003",
-    "kelompok": "25-54",
+    "rentangUmur": "25-54",
     "jumlah": 1680,
     "tahun": 2026
   },
   {
     "id": "cmk-umur-004",
-    "kelompok": "55-64",
+    "rentangUmur": "55-64",
     "jumlah": 520,
     "tahun": 2026
   },
   {
     "id": "cmk-umur-005",
-    "kelompok": "65+",
+    "rentangUmur": "65+",
     "jumlah": 545,
     "tahun": 2026
   }