Move apps to mobile directory structure

Relocated all app directories (client, design_system_viewer, staff) and their contents under the new 'apps/mobile' path. This change improves project organization and prepares for future platform-specific structuring.

apps/mobile/packages/domain/lib/src/entities/users/biz_member.dart

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+import 'package:equatable/equatable.dart';
+
+/// Represents a member of a Business.
+///
+/// Grants a user access to business-level operations.
+class BizMember extends Equatable {
+  /// Unique identifier for this membership.
+  final String id;
+
+  /// The [Business] the user belongs to.
+  final String businessId;
+
+  /// The [User] who is a member.
+  final String userId;
+
+  /// The role within the business.
+  final String role;
+
+  const BizMember({
+    required this.id,
+    required this.businessId,
+    required this.userId,
+    required this.role,
+  });
+
+  @override
+  List<Object?> get props => [id, businessId, userId, role];
+}

apps/mobile/packages/domain/lib/src/entities/users/hub_member.dart

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+import 'package:equatable/equatable.dart';
+
+/// Represents a member of a Hub.
+///
+/// Grants a user access to specific [Hub] operations, distinct from [BizMember].
+class HubMember extends Equatable {
+  /// Unique identifier for this membership.
+  final String id;
+
+  /// The [Hub] the user belongs to.
+  final String hubId;
+
+  /// The [User] who is a member.
+  final String userId;
+
+  /// The role within the hub.
+  final String role;
+
+  const HubMember({
+    required this.id,
+    required this.hubId,
+    required this.userId,
+    required this.role,
+  });
+
+  @override
+  List<Object?> get props => [id, hubId, userId, role];
+}

apps/mobile/packages/domain/lib/src/entities/users/membership.dart

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+import 'package:equatable/equatable.dart';
+
+/// Represents a polymorphic membership to an organization unit.
+///
+/// Allows a [User] to be a member of either a [Business] or a [Hub].
+class Membership extends Equatable {
+  /// Unique identifier for the membership record.
+  final String id;
+
+  /// The [User] holding this membership.
+  final String userId;
+
+  /// The ID of the organization unit (Business or Hub).
+  final String memberableId;
+
+  /// The type of the organization unit ('business' or 'hub').
+  final String memberableType;
+
+  /// The role within that organization (e.g., 'manager', 'viewer').
+  final String role;
+
+  const Membership({
+    required this.id,
+    required this.userId,
+    required this.memberableId,
+    required this.memberableType,
+    required this.role,
+  });
+
+  @override
+  List<Object?> get props => [id, userId, memberableId, memberableType, role];
+}

apps/mobile/packages/domain/lib/src/entities/users/staff.dart

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+import 'package:equatable/equatable.dart';
+
+/// The lifecycle status of a [Staff] account.
+enum StaffStatus {
+  /// Account created but profile not started.
+  registered,
+
+  /// Profile submitted and awaiting verification.
+  pending,
+
+  /// Profile information filled but not submitted for verification.
+  completedProfile,
+
+  /// Profile verified by admin.
+  verified,
+
+  /// Staff is currently active and eligible for work.
+  active,
+
+  /// Account is temporarily suspended.
+  blocked,
+
+  /// Account is permanently inactive.
+  inactive,
+}
+
+/// Represents a worker profile.
+///
+/// Contains all personal and professional details of a staff member.
+/// Linked to a [User] via [authProviderId].
+class Staff extends Equatable {
+  /// Unique identifier for the staff profile.
+  final String id;
+
+  /// Link to the [User] authentication record.
+  final String authProviderId;
+
+  /// Full display name.
+  final String name;
+
+  /// Contact email.
+  final String email;
+
+  /// Contact phone number.
+  final String? phone;
+
+  /// Current workflow status of the staff member.
+  final StaffStatus status;
+
+  /// Physical address string.
+  final String? address;
+
+  /// URL to the avatar image.
+  final String? avatar;
+
+  /// URL to a verified live photo for identity verification.
+  final String? livePhoto;
+
+  const Staff({
+    required this.id,
+    required this.authProviderId,
+    required this.name,
+    required this.email,
+    this.phone,
+    required this.status,
+    this.address,
+    this.avatar,
+    this.livePhoto,
+  });
+
+  @override
+  List<Object?> get props => [
+        id,
+        authProviderId,
+        name,
+        email,
+        phone,
+        status,
+        address,
+        avatar,
+        livePhoto,
+      ];
+}

apps/mobile/packages/domain/lib/src/entities/users/user.dart

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+import 'package:equatable/equatable.dart';
+
+/// Represents a base authenticated user in the KROW platform.
+///
+/// This entity corresponds to the Firebase Auth user record and acts as the
+/// linkage between the authentication system and the specific [Staff] or Client profiles.
+class User extends Equatable {
+  /// The unique identifier from the authentication provider (e.g., Firebase UID).
+  final String id;
+
+  /// The user's email address.
+  final String email;
+
+  /// The user's phone number, if available.
+  final String? phone;
+
+  /// The primary role of the user (e.g., 'staff', 'client_admin').
+  /// This determines the initial routing and permissions.
+  final String role;
+
+  const User({
+    required this.id,
+    required this.email,
+    this.phone,
+    required this.role,
+  });
+
+  @override
+  List<Object?> get props => [id, email, phone, role];
+}