Rename company-scoped Users to Members throughout

Complete rename across backend and frontend:
- Controller: Company/Users/UsersController -> Company/Members/MembersController
- Service: UserService -> MemberService
- Requests: UserRequest -> MemberRequest, DeleteUserRequest -> DeleteMemberRequest
- API routes: /api/v1/users -> /api/v1/members (company-scoped only)
- Sidebar menu: "Users" -> "Members"
- Frontend: views/users -> views/members, stores/users -> stores/members
- Router: users.index -> members.index, /admin/users -> /admin/members
- i18n: new "members" section with invitation-related keys
- Tests: UserTest -> MemberTest

Admin/super-admin Users (system-wide user management) remains unchanged.

tests/Feature/Admin/MemberTest.php

@@ -0,0 +1,50 @@
+<?php
+
+use App\Http\Controllers\Company\Members\MembersController;
+use App\Http\Requests\MemberRequest;
+use App\Models\User;
+use Laravel\Sanctum\Sanctum;
+
+use function Pest\Laravel\getJson;
+
+beforeEach(function () {
+    Artisan::call('db:seed', ['--class' => 'DatabaseSeeder', '--force' => true]);
+    Artisan::call('db:seed', ['--class' => 'DemoSeeder', '--force' => true]);
+
+    $user = User::where('role', 'super admin')->first();
+
+    $this->withHeaders([
+        'company' => $user->companies()->first()->id,
+    ]);
+
+    Sanctum::actingAs(
+        $user,
+        ['*']
+    );
+});
+
+test('list members', function () {
+    getJson('/api/v1/members')->assertOk();
+});
+
+test('store member using a form request', function () {
+    $this->assertActionUsesFormRequest(
+        MembersController::class,
+        'store',
+        MemberRequest::class
+    );
+});
+
+test('get member', function () {
+    $user = User::factory()->create();
+
+    getJson("/api/v1/members/{$user->id}")->assertOk();
+});
+
+test('update member using a form request', function () {
+    $this->assertActionUsesFormRequest(
+        MembersController::class,
+        'update',
+        MemberRequest::class
+    );
+});