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/business/biz_contract.dart

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+import 'package:equatable/equatable.dart';
+
+/// Represents a legal or service contract.
+///
+/// Can be between a business and the platform, or a business and staff.
+class BizContract extends Equatable {
+  /// Unique identifier.
+  final String id;
+
+  /// The [Business] party to the contract.
+  final String businessId;
+
+  /// Descriptive name of the contract.
+  final String name;
+
+  /// Valid from date.
+  final DateTime startDate;
+
+  /// Valid until date (null if indefinite).
+  final DateTime? endDate;
+
+  /// URL to the document content (PDF/HTML).
+  final String contentUrl;
+
+  const BizContract({
+    required this.id,
+    required this.businessId,
+    required this.name,
+    required this.startDate,
+    this.endDate,
+    required this.contentUrl,
+  });
+
+  @override
+  List<Object?> get props => [id, businessId, name, startDate, endDate, contentUrl];
+}

apps/mobile/packages/domain/lib/src/entities/business/business.dart

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+import 'package:equatable/equatable.dart';
+
+/// The operating status of a [Business].
+enum BusinessStatus {
+  /// Business created but not yet approved.
+  pending,
+
+  /// Fully active and operational.
+  active,
+
+  /// Temporarily suspended (e.g. for non-payment).
+  suspended,
+
+  /// Permanently inactive.
+  inactive,
+}
+
+/// Represents a Client Company / Business.
+///
+/// This is the top-level organizational entity in the system.
+class Business extends Equatable {
+  /// Unique identifier for the business.
+  final String id;
+
+  /// Display name of the business.
+  final String name;
+
+  /// Legal registration or tax number.
+  final String registrationNumber;
+
+  /// Current operating status.
+  final BusinessStatus status;
+
+  /// URL to the business logo.
+  final String? avatar;
+
+  const Business({
+    required this.id,
+    required this.name,
+    required this.registrationNumber,
+    required this.status,
+    this.avatar,
+  });
+
+  @override
+  List<Object?> get props => [id, name, registrationNumber, status, avatar];
+}

apps/mobile/packages/domain/lib/src/entities/business/business_setting.dart

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+import 'package:equatable/equatable.dart';
+
+/// Represents payroll and operational configuration for a [Business].
+class BusinessSetting extends Equatable {
+  /// Unique identifier for the settings record.
+  final String id;
+
+  /// The [Business] these settings apply to.
+  final String businessId;
+
+  /// Prefix for generated invoices (e.g., "INV-").
+  final String prefix;
+
+  /// Whether overtime calculations are applied.
+  final bool overtimeEnabled;
+
+  /// Requirement method for clocking in (e.g. "qr_code", "geo_fence").
+  final String? clockInRequirement;
+
+  /// Requirement method for clocking out.
+  final String? clockOutRequirement;
+
+  const BusinessSetting({
+    required this.id,
+    required this.businessId,
+    required this.prefix,
+    required this.overtimeEnabled,
+    this.clockInRequirement,
+    this.clockOutRequirement,
+  });
+
+  @override
+  List<Object?> get props => [
+        id,
+        businessId,
+        prefix,
+        overtimeEnabled,
+        clockInRequirement,
+        clockOutRequirement,
+      ];
+}

apps/mobile/packages/domain/lib/src/entities/business/hub.dart

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+import 'package:equatable/equatable.dart';
+
+/// The status of a [Hub].
+enum HubStatus {
+  /// Fully operational.
+  active,
+
+  /// Closed or inactive.
+  inactive,
+
+  /// Not yet ready for operations.
+  underConstruction,
+}
+
+/// Represents a branch location or operational unit within a [Business].
+class Hub extends Equatable {
+  /// Unique identifier.
+  final String id;
+
+  /// The parent [Business].
+  final String businessId;
+
+  /// Display name of the hub (e.g. "Downtown Branch").
+  final String name;
+
+  /// Physical address of this hub.
+  final String address;
+
+  /// Unique identifier of the NFC tag assigned to this hub.
+  final String? nfcTagId;
+
+  /// Operational status.
+  final HubStatus status;
+
+  const Hub({
+    required this.id,
+    required this.businessId,
+    required this.name,
+    required this.address,
+    this.nfcTagId,
+    required this.status,
+  });
+
+  @override
+  List<Object?> get props => [id, businessId, name, address, nfcTagId, status];
+}

apps/mobile/packages/domain/lib/src/entities/business/hub_department.dart

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+import 'package:equatable/equatable.dart';
+
+/// Represents a department within a [Hub].
+///
+/// Used for more granular organization of staff and events (e.g. "Kitchen", "Service").
+class HubDepartment extends Equatable {
+  /// Unique identifier.
+  final String id;
+
+  /// The [Hub] this department belongs to.
+  final String hubId;
+
+  /// Name of the department.
+  final String name;
+
+  const HubDepartment({
+    required this.id,
+    required this.hubId,
+    required this.name,
+  });
+
+  @override
+  List<Object?> get props => [id, hubId, name];
+}