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/ratings/business_staff_preference.dart

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+import 'package:equatable/equatable.dart';
+
+/// The type of preference a business has for a staff member.
+enum PreferenceType {
+  /// Business wants to prioritize this staff member.
+  favorite,
+
+  /// Business does not want to work with this staff member.
+  blocked,
+}
+
+/// Represents a business's specific preference for a staff member.
+class BusinessStaffPreference extends Equatable {
+  /// Unique identifier.
+  final String id;
+
+  /// The [Business] holding the preference.
+  final String businessId;
+
+  /// The [Staff] member.
+  final String staffId;
+
+  /// Whether they are a favorite or blocked.
+  final PreferenceType type;
+
+  const BusinessStaffPreference({
+    required this.id,
+    required this.businessId,
+    required this.staffId,
+    required this.type,
+  });
+
+  @override
+  List<Object?> get props => [id, businessId, staffId, type];
+}

apps/mobile/packages/domain/lib/src/entities/ratings/penalty_log.dart

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+import 'package:equatable/equatable.dart';
+
+/// Represents a penalty issued to a staff member.
+///
+/// Penalties are issued for no-shows, cancellations, or poor conduct.
+class PenaltyLog extends Equatable {
+  /// Unique identifier.
+  final String id;
+
+  /// The [Staff] member penalized.
+  final String staffId;
+
+  /// The [Assignment] context (if applicable).
+  final String assignmentId;
+
+  /// Reason for the penalty.
+  final String reason;
+
+  /// Score points deducted from staff profile.
+  final int points;
+
+  /// When the penalty was issued.
+  final DateTime issuedAt;
+
+  const PenaltyLog({
+    required this.id,
+    required this.staffId,
+    required this.assignmentId,
+    required this.reason,
+    required this.points,
+    required this.issuedAt,
+  });
+
+  @override
+  List<Object?> get props => [id, staffId, assignmentId, reason, points, issuedAt];
+}

apps/mobile/packages/domain/lib/src/entities/ratings/staff_rating.dart

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+import 'package:equatable/equatable.dart';
+
+/// Represents a rating given to a staff member by a client.
+class StaffRating extends Equatable {
+  /// Unique identifier.
+  final String id;
+
+  /// The [Staff] being rated.
+  final String staffId;
+
+  /// The [Event] context.
+  final String eventId;
+
+  /// The [Business] leaving the rating.
+  final String businessId;
+
+  /// Star rating (1-5).
+  final int rating;
+
+  /// Optional feedback text.
+  final String? comment;
+
+  const StaffRating({
+    required this.id,
+    required this.staffId,
+    required this.eventId,
+    required this.businessId,
+    required this.rating,
+    this.comment,
+  });
+
+  @override
+  List<Object?> get props => [id, staffId, eventId, businessId, rating, comment];
+}