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.

resources/scripts/admin/admin-router.js

@@ -66,9 +66,9 @@ const ItemCreate = () => import('@/scripts/admin/views/items/Create.vue')
 const ExpensesIndex = () => import('@/scripts/admin/views/expenses/Index.vue')
 const ExpenseCreate = () => import('@/scripts/admin/views/expenses/Create.vue')
 
-// Users
-const UserIndex = () => import('@/scripts/admin/views/users/Index.vue')
-const UserCreate = () => import('@/scripts/admin/views/users/Create.vue')
+// Members
+const MemberIndex = () => import('@/scripts/admin/views/members/Index.vue')
+const MemberCreate = () => import('@/scripts/admin/views/members/Create.vue')
 
 // Estimates
 const EstimateIndex = () => import('@/scripts/admin/views/estimates/Index.vue')
@@ -391,24 +391,24 @@ export default [
         component: ExpenseCreate,
       },
 
-      // Users
+      // Members
       {
-        path: 'users',
-        name: 'users.index',
+        path: 'members',
+        name: 'members.index',
         meta: { isOwner: true },
-        component: UserIndex,
+        component: MemberIndex,
       },
       {
-        path: 'users/create',
+        path: 'members/create',
         meta: { isOwner: true },
-        name: 'users.create',
-        component: UserCreate,
+        name: 'members.create',
+        component: MemberCreate,
       },
       {
-        path: 'users/:id/edit',
-        name: 'users.edit',
+        path: 'members/:id/edit',
+        name: 'members.edit',
         meta: { isOwner: true },
-        component: UserCreate,
+        component: MemberCreate,
       },
 
       // Estimates