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/events/assignment.dart

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+import 'package:equatable/equatable.dart';
+
+/// The status of a staff [Assignment].
+enum AssignmentStatus {
+  /// Staff member has been assigned but hasn't confirmed.
+  assigned,
+
+  /// Staff member has accepted the assignment.
+  confirmed,
+
+  /// Work is currently in progress (Clocked In).
+  ongoing,
+
+  /// Work completed successfully (Clocked Out).
+  completed,
+
+  /// Staff rejected the assignment offer.
+  declinedByStaff,
+
+  /// Staff canceled after accepting.
+  canceledByStaff,
+
+  /// Staff did not show up.
+  noShowed,
+}
+
+/// Represents the link between a [Staff] member and an [EventShiftPosition].
+class Assignment extends Equatable {
+  /// Unique identifier.
+  final String id;
+
+  /// The job position being filled.
+  final String positionId;
+
+  /// The staff member filling the position.
+  final String staffId;
+
+  /// Current status of the assignment.
+  final AssignmentStatus status;
+
+  /// Actual timestamp when staff clocked in.
+  final DateTime? clockIn;
+
+  /// Actual timestamp when staff clocked out.
+  final DateTime? clockOut;
+
+  const Assignment({
+    required this.id,
+    required this.positionId,
+    required this.staffId,
+    required this.status,
+    this.clockIn,
+    this.clockOut,
+  });
+
+  @override
+  List<Object?> get props => [id, positionId, staffId, status, clockIn, clockOut];
+}

apps/mobile/packages/domain/lib/src/entities/events/event.dart

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+import 'package:equatable/equatable.dart';
+
+/// The workflow status of an [Event].
+enum EventStatus {
+  /// Created but incomplete.
+  draft,
+
+  /// Waiting for approval or publication.
+  pending,
+
+  /// Published and staff have been assigned.
+  assigned,
+
+  /// Fully confirmed and ready to start.
+  confirmed,
+
+  /// Currently in progress.
+  active,
+
+  /// Work has finished.
+  finished,
+
+  /// All post-event processes (invoicing) complete.
+  completed,
+
+  /// Archived.
+  closed,
+
+  /// Flagged for administrative review.
+  underReview,
+}
+
+/// Represents a Job Posting or Event.
+///
+/// This is the central entity for scheduling work. An Event contains [EventShift]s.
+class Event extends Equatable {
+  /// Unique identifier.
+  final String id;
+
+  /// The [Business] hosting the event.
+  final String businessId;
+
+  /// The [Hub] location.
+  final String hubId;
+
+  /// Title of the event.
+  final String name;
+
+  /// Date of the event.
+  final DateTime date;
+
+  /// Current workflow status.
+  final EventStatus status;
+
+  /// Type of employment contract (e.g., 'freelance', 'permanent').
+  final String contractType;
+
+  const Event({
+    required this.id,
+    required this.businessId,
+    required this.hubId,
+    required this.name,
+    required this.date,
+    required this.status,
+    required this.contractType,
+  });
+
+  @override
+  List<Object?> get props => [id, businessId, hubId, name, date, status, contractType];
+}

apps/mobile/packages/domain/lib/src/entities/events/event_shift.dart

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+import 'package:equatable/equatable.dart';
+
+/// Represents a specific time block or "shift" within an [Event].
+///
+/// An Event can have multiple shifts (e.g. "Morning Shift", "Evening Shift").
+class EventShift extends Equatable {
+  /// Unique identifier.
+  final String id;
+
+  /// The [Event] this shift belongs to.
+  final String eventId;
+
+  /// Descriptive name (e.g. "Setup Crew").
+  final String name;
+
+  /// Specific address for this shift (if different from Hub).
+  final String address;
+
+  const EventShift({
+    required this.id,
+    required this.eventId,
+    required this.name,
+    required this.address,
+  });
+
+  @override
+  List<Object?> get props => [id, eventId, name, address];
+}

apps/mobile/packages/domain/lib/src/entities/events/event_shift_position.dart

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+import 'package:equatable/equatable.dart';
+
+/// Represents a specific job opening within a [EventShift].
+///
+/// Defines the requirement for a specific [Skill], the quantity needed, and the pay.
+class EventShiftPosition extends Equatable {
+  /// Unique identifier.
+  final String id;
+
+  /// The [EventShift] this position is part of.
+  final String shiftId;
+
+  /// The [Skill] required for this position.
+  final String skillId;
+
+  /// Number of staff needed.
+  final int count;
+
+  /// Hourly pay rate.
+  final double rate;
+
+  /// Start time of this specific position.
+  final DateTime startTime;
+
+  /// End time of this specific position.
+  final DateTime endTime;
+
+  /// Deducted break duration in minutes.
+  final int breakDurationMinutes;
+
+  const EventShiftPosition({
+    required this.id,
+    required this.shiftId,
+    required this.skillId,
+    required this.count,
+    required this.rate,
+    required this.startTime,
+    required this.endTime,
+    required this.breakDurationMinutes,
+  });
+
+  @override
+  List<Object?> get props => [
+        id,
+        shiftId,
+        skillId,
+        count,
+        rate,
+        startTime,
+        endTime,
+        breakDurationMinutes,
+      ];
+}

apps/mobile/packages/domain/lib/src/entities/events/work_session.dart

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+import 'package:equatable/equatable.dart';
+
+/// Represents a verified record of time worked.
+///
+/// Derived from [Assignment] clock-in/out times, used for payroll.
+class WorkSession extends Equatable {
+  /// Unique identifier.
+  final String id;
+
+  /// The [Assignment] this session belongs to.
+  final String assignmentId;
+
+  /// Verified start time.
+  final DateTime startTime;
+
+  /// Verified end time.
+  final DateTime? endTime;
+
+  /// Verified break duration.
+  final int breakDurationMinutes;
+
+  const WorkSession({
+    required this.id,
+    required this.assignmentId,
+    required this.startTime,
+    this.endTime,
+    required this.breakDurationMinutes,
+  });
+
+  @override
+  List<Object?> get props => [id, assignmentId, startTime, endTime, breakDurationMinutes];
+}