feat(cities): cities are a tree again, as legacy's; old dashboard permissions merged (PERS-02, PERM-01)

Cities (owner: as legacy)
- City.parentId (self relation) replaces the flat `province` label; the
  migration turns each label into a parent row («استان …») first, so nothing
  is lost.
- Admin pickers are legacy's tree (CityTreeSelect): the top level, the
  country, is a heading. The city form and grid get «والد».
- Restored legacy _getP: a city without its own percent takes its
  ancestor's. Restored the omde-customer form's city → percent autofill.
- Import copies legacy parents; delete refuses a city with children; a
  parent loop is refused.

Permissions (owner approved the deletion)
- dashboard / dashboard.omde / dashboard.tak rows become dashboard.view,
  then are deleted.
- Import maps them the same way: legacy types 102, 104, 105, 108 and 135
  had lost the dashboard.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/api/prisma/seed.ts

@@ -113,11 +113,22 @@ async function main() {
   }
 
   // ── Cities ────────────────────────────────────────────────────────────
+  // A tree, as legacy's: country > province > city. The country is a heading
+  // in the admin pickers; provinces and cities are selectable.
+  const city = (id: string, name: string, parentId: string | null) =>
+    prisma.city.upsert({ where: { id }, update: {}, create: { id, name, parentId } });
+  await city('city-iran', 'ایران', null);
+  await Promise.all([
+    city('city-prov-tehran', 'استان تهران', 'city-iran'),
+    city('city-prov-khorasan-razavi', 'استان خراسان رضوی', 'city-iran'),
+    city('city-prov-isfahan', 'استان اصفهان', 'city-iran'),
+    city('city-prov-east-azarbaijan', 'استان آذربایجان شرقی', 'city-iran'),
+  ]);
   const [tehran, mashhad, isfahan, tabriz] = await Promise.all([
-    prisma.city.upsert({ where: { id: 'city-tehran' }, update: {}, create: { id: 'city-tehran', name: 'تهران', province: 'تهران' } }),
-    prisma.city.upsert({ where: { id: 'city-mashhad' }, update: {}, create: { id: 'city-mashhad', name: 'مشهد', province: 'خراسان رضوی' } }),
-    prisma.city.upsert({ where: { id: 'city-isfahan' }, update: {}, create: { id: 'city-isfahan', name: 'اصفهان', province: 'اصفهان' } }),
-    prisma.city.upsert({ where: { id: 'city-tabriz' }, update: {}, create: { id: 'city-tabriz', name: 'تبریز', province: 'آذربایجان شرقی' } }),
+    city('city-tehran', 'تهران', 'city-prov-tehran'),
+    city('city-mashhad', 'مشهد', 'city-prov-khorasan-razavi'),
+    city('city-isfahan', 'اصفهان', 'city-prov-isfahan'),
+    city('city-tabriz', 'تبریز', 'city-prov-east-azarbaijan'),
   ]);
 
   // ── Branches & workshop ──────────────────────────────────────────────