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/skills/certificate.dart

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+import 'package:equatable/equatable.dart';
+
+/// Represents a required certificate definition.
+///
+/// Examples: "Food Hygiene Level 2", "SIA Badge".
+class Certificate extends Equatable {
+  /// Unique identifier.
+  final String id;
+
+  /// Display name of the certificate.
+  final String name;
+
+  /// Whether this certificate is mandatory for platform access or specific roles.
+  final bool isRequired;
+
+  const Certificate({
+    required this.id,
+    required this.name,
+    required this.isRequired,
+  });
+
+  @override
+  List<Object?> get props => [id, name, isRequired];
+}

apps/mobile/packages/domain/lib/src/entities/skills/skill.dart

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+import 'package:equatable/equatable.dart';
+
+/// Represents a job category / skill type.
+///
+/// Examples: "Waiter", "Security Guard", "Bartender".
+/// Linked to a [SkillCategory].
+class Skill extends Equatable {
+  /// Unique identifier.
+  final String id;
+
+  /// The broader category (e.g. "Hospitality").
+  final String categoryId;
+
+  /// Display name of the skill.
+  final String name;
+
+  /// Default hourly rate suggested for this skill.
+  final double basePrice;
+
+  const Skill({
+    required this.id,
+    required this.categoryId,
+    required this.name,
+    required this.basePrice,
+  });
+
+  @override
+  List<Object?> get props => [id, categoryId, name, basePrice];
+}

apps/mobile/packages/domain/lib/src/entities/skills/skill_category.dart

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+import 'package:equatable/equatable.dart';
+
+/// Represents a broad category of skills (e.g. "Hospitality", "Logistics").
+class SkillCategory extends Equatable {
+  /// Unique identifier.
+  final String id;
+
+  /// Display name.
+  final String name;
+
+  const SkillCategory({
+    required this.id,
+    required this.name,
+  });
+
+  @override
+  List<Object?> get props => [id, name];
+}

apps/mobile/packages/domain/lib/src/entities/skills/skill_kit.dart

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+import 'package:equatable/equatable.dart';
+
+/// Represents required equipment or uniform for a specific [Skill].
+///
+/// Examples: "Black Shirt" (Uniform), "Safety Boots" (Equipment).
+class SkillKit extends Equatable {
+  /// Unique identifier.
+  final String id;
+
+  /// The [Skill] this kit applies to.
+  final String skillId;
+
+  /// Description of the item.
+  final String name;
+
+  /// Whether the staff member MUST possess this item.
+  final bool isRequired;
+
+  /// Type of kit ('uniform' or 'equipment').
+  final String type;
+
+  const SkillKit({
+    required this.id,
+    required this.skillId,
+    required this.name,
+    required this.isRequired,
+    required this.type,
+  });
+
+  @override
+  List<Object?> get props => [id, skillId, name, isRequired, type];
+}

apps/mobile/packages/domain/lib/src/entities/skills/staff_skill.dart

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+import 'package:equatable/equatable.dart';
+
+/// The expertise level of a staff member in a specific skill.
+enum SkillLevel {
+  /// Entry level.
+  beginner,
+
+  /// Experienced.
+  skilled,
+
+  /// Expert / Managerial level.
+  professional,
+}
+
+/// The verification status of a claimed skill.
+enum StaffSkillStatus {
+  /// Claimed by staff, waiting for admin approval.
+  pending,
+
+  /// Verified by admin (documents checked).
+  verified,
+
+  /// Rejected by admin.
+  rejected,
+}
+
+/// Represents a staff member's qualification in a specific [Skill].
+class StaffSkill extends Equatable {
+  /// Unique identifier.
+  final String id;
+
+  /// The [Staff] member.
+  final String staffId;
+
+  /// The [Skill] they possess.
+  final String skillId;
+
+  /// Their expertise level.
+  final SkillLevel level;
+
+  /// Years of experience.
+  final int experienceYears;
+
+  /// Verification status.
+  final StaffSkillStatus status;
+
+  const StaffSkill({
+    required this.id,
+    required this.staffId,
+    required this.skillId,
+    required this.level,
+    required this.experienceYears,
+    required this.status,
+  });
+
+  @override
+  List<Object?> get props => [id, staffId, skillId, level, experienceYears, status];
+}