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/profile/accessibility.dart

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+import 'package:equatable/equatable.dart';
+
+/// Represents accessibility requirements or features.
+///
+/// Can apply to Staff (needs) or Events (provision).
+class Accessibility extends Equatable {
+  /// Unique identifier.
+  final String id;
+
+  /// Description (e.g. "Wheelchair Access").
+  final String name;
+
+  const Accessibility({
+    required this.id,
+    required this.name,
+  });
+
+  @override
+  List<Object?> get props => [id, name];
+}

apps/mobile/packages/domain/lib/src/entities/profile/bank_account.dart

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+import 'package:equatable/equatable.dart';
+
+/// Represents bank account details for payroll.
+class BankAccount extends Equatable {
+  /// Unique identifier.
+  final String id;
+
+  /// The [User] owning the account.
+  final String userId;
+
+  /// Name of the bank.
+  final String bankName;
+
+  /// Account number.
+  final String accountNumber;
+
+  /// Name on the account.
+  final String accountName;
+
+  /// Sort code (if applicable).
+  final String? sortCode;
+
+  const BankAccount({
+    required this.id,
+    required this.userId,
+    required this.bankName,
+    required this.accountNumber,
+    required this.accountName,
+    this.sortCode,
+  });
+
+  @override
+  List<Object?> get props => [id, userId, bankName, accountNumber, accountName, sortCode];
+}

apps/mobile/packages/domain/lib/src/entities/profile/emergency_contact.dart

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+import 'package:equatable/equatable.dart';
+
+/// Represents an emergency contact for a user.
+///
+/// Critical for staff safety during shifts.
+class EmergencyContact extends Equatable {
+  /// Full name of the contact.
+  final String name;
+
+  /// Relationship to the user (e.g. "Spouse", "Parent").
+  final String relationship;
+
+  /// Phone number.
+  final String phone;
+
+  const EmergencyContact({
+    required this.name,
+    required this.relationship,
+    required this.phone,
+  });
+
+  @override
+  List<Object?> get props => [name, relationship, phone];
+}

apps/mobile/packages/domain/lib/src/entities/profile/schedule.dart

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+import 'package:equatable/equatable.dart';
+
+/// Represents general availability schedule for a [Staff] member.
+///
+/// Defines recurring availability (e.g., "Mondays 9-5").
+class Schedule extends Equatable {
+  /// Unique identifier.
+  final String id;
+
+  /// The [Staff] member.
+  final String staffId;
+
+  /// Day of the week (1 = Monday, 7 = Sunday).
+  final int dayOfWeek;
+
+  /// Start time of availability.
+  final DateTime startTime;
+
+  /// End time of availability.
+  final DateTime endTime;
+
+  const Schedule({
+    required this.id,
+    required this.staffId,
+    required this.dayOfWeek,
+    required this.startTime,
+    required this.endTime,
+  });
+
+  @override
+  List<Object?> get props => [id, staffId, dayOfWeek, startTime, endTime];
+}