feat(monetization-261): prepare entitlement infrastructure and quota enforcement for release

- Add EntitlementSnapshot, EntitlementRevalidationUseCase, and BillingUseCases
- Add DriftEntitlementSnapshotRepository for offline entitlement caching
- Add HealthConnect gateway and integration
- Add quota enforcement in share acceptance (server and UI)
- Add entitlement API endpoints in server
- Add privacy policy v1 and release compliance checklist
- Add QA gates and device runbooks for release validation
- Add demo content screen and settings screen

Ticket #261

lib/presentation/share_inbox_screen.dart

@@ -4,6 +4,7 @@ import 'package:flutter/material.dart';
 
 import '../application/application.dart';
 import '../domain/domain.dart';
+import 'monetization_ui.dart';
 import 'theme.dart';
 
 final class ShareInboxScreen extends StatefulWidget {
@@ -176,6 +177,11 @@ final class _ShareInboxTile extends StatelessWidget {
             ],
           ),
           if (item.status == ShareInboxStatus.pending) ...[
+            const SizedBox(height: 16),
+            QuotaImpactNotice(
+              acceptedItemCount: _quotaImpactCount(item, summary),
+              acceptedItemLabel: _quotaImpactLabel(item.resourceType),
+            ),
             const SizedBox(height: 16),
             if (item.resourceType == ShareResourceType.pack)
               FilledButton(onPressed: onOpen, child: const Text('Voir le pack'))
@@ -273,6 +279,11 @@ final class _SharePackDetailScreen extends StatelessWidget {
                     title: Text(name),
                   ),
                 if (item.status == ShareInboxStatus.pending) ...[
+                  const SizedBox(height: 16),
+                  QuotaImpactNotice(
+                    acceptedItemCount: _quotaImpactCount(item, summary),
+                    acceptedItemLabel: _quotaImpactLabel(item.resourceType),
+                  ),
                   const SizedBox(height: 16),
                   FilledButton(
                     onPressed: onImport == null
@@ -390,6 +401,22 @@ String _packBadge(int count) {
   return 'Pack · $count séance${count > 1 ? 's' : ''}';
 }
 
+int _quotaImpactCount(ShareInboxItem item, _InboxSummary summary) {
+  return switch (item.resourceType) {
+    ShareResourceType.program => 1,
+    ShareResourceType.workoutTemplate => 1,
+    ShareResourceType.pack => summary.itemCount,
+  };
+}
+
+String _quotaImpactLabel(ShareResourceType type) {
+  return switch (type) {
+    ShareResourceType.program => 'programme',
+    ShareResourceType.workoutTemplate => 'séance',
+    ShareResourceType.pack => 'séance',
+  };
+}
+
 IconData _resourceIcon(ShareResourceType type) {
   return switch (type) {
     ShareResourceType.program => Icons.list_alt,