feat : add User CRUD with admin management

Add User API operations (GET, POST, PATCH, DELETE) with password
hashing processor, frontend service, drawer and admin tab.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/services/dto/user-data.ts

@@ -1,5 +1,12 @@
 export type UserData = {
-  id: number
-  username: string
-  roles: string[]
+    id: number
+    '@id'?: string
+    username: string
+    roles: string[]
+}
+
+export type UserWrite = {
+    username: string
+    password?: string
+    roles: string[]
 }

frontend/services/users.ts

@@ -0,0 +1,32 @@
+import type { UserData, UserWrite } from './dto/user-data'
+import type { HydraCollection } from '~/utils/api'
+import { extractHydraMembers } from '~/utils/api'
+
+export function useUserService() {
+    const api = useApi()
+
+    async function getAll(): Promise<UserData[]> {
+        const data = await api.get<HydraCollection<UserData>>('/users')
+        return extractHydraMembers(data)
+    }
+
+    async function create(payload: UserWrite): Promise<UserData> {
+        return api.post<UserData>('/users', payload as Record<string, unknown>, {
+            toastSuccessKey: 'users.created',
+        })
+    }
+
+    async function update(id: number, payload: Partial<UserWrite>): Promise<UserData> {
+        return api.patch<UserData>(`/users/${id}`, payload as Record<string, unknown>, {
+            toastSuccessKey: 'users.updated',
+        })
+    }
+
+    async function remove(id: number): Promise<void> {
+        await api.delete(`/users/${id}`, {}, {
+            toastSuccessKey: 'users.deleted',
+        })
+    }
+
+    return { getAll, create, update, remove }
+}