fix(migrations): rebase audit_logs migration onto main's 027_ensure_shared_links_table

- Add 027_ensure_shared_links_table.py from main branch
- Renumber 027_add_audit_logs → 028_add_audit_logs
- Update down_revision to chain from 027_ensure_shared_links_table
- Restore all model imports in migrations/env.py (were dropped in previous PR)
- Restore shared_links in db_migrate.py _TABLE_ORDER

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

migrations/env.py

@@ -20,14 +20,29 @@ from app.database import Base
 
 # Ensure all models are imported so Base.metadata is populated.
 from app.models import (  # noqa: F401
+    ApiToken,
     ApplicationSettings,
     AuditLog,
+    BackupRecord,
     DocumentMetadata,
     FileProcessingStep,
     FileRecord,
+    InAppNotification,
+    LocalUser,
+    Pipeline,
+    PipelineStep,
     ProcessingLog,
     SavedSearch,
+    ScheduledJob,
     SettingsAuditLog,
+    SharedLink,
+    SubscriptionPlan,
+    UserImapAccount,
+    UserIntegration,
+    UserNotificationPreference,
+    UserNotificationTarget,
+    UserProfile,
+    WebhookConfig,
 )
 
 # Alembic Config object – provides access to values in alembic.ini.