feat(unit): add unit detail page with position management

- Create new unit detail page with route and navigation
- Add unit detail component to display basic unit information
- Implement position list management with pagination and actions
- Include position creation, editing and deletion functionality
- Update unit model to include installation relationship

app/models/unit.ts

@@ -1,9 +1,11 @@
-import { type Base, genBase } from "./_base"
-
+import { type Base, genBase } from './_base'
+import { type Installation } from '~/models/installation'
 export interface Unit extends Base {
   code: string
   name: string
   installation_id?: number | string | null
+
+  installation?: Installation
 }
 
 export function genUnit(): Unit {