fix: resolve merge conflicts with main branch

Merge origin/main into feature branch, resolving 3 conflicts:
- app/api/__init__.py: add classification_rules_router alongside new
  routers from main (audit_logs, i18n, mobile, compliance, translation)
- app/models.py: keep ClassificationRuleModel alongside new models from
  main (MobileDevice, ComplianceTemplate, PipelineRoutingRule)
- tests/conftest.py: import both ClassificationRuleModel and new models
  from main (AuditLog, ComplianceTemplate)

Also renumber migration from 027 to 037 to chain from the latest
migration on main (036_add_document_translation_fields).

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

tests/test_path_traversal_security.py

@@ -212,9 +212,10 @@ class TestExtractMetadataFilenameValidation:
         """Test that invalid filename formats are rejected."""
         import re
 
-        # Valid pattern from extract_metadata_with_gpt.py
-        # TODO: Consider extracting this to a shared constant to avoid duplication
-        valid_pattern = r"^[\w\-\. ]+$"
+        from app.utils.filename_utils import VALID_FILENAME_PATTERN
+
+        # Valid pattern from app.utils.filename_utils
+        valid_pattern = VALID_FILENAME_PATTERN
 
         # Test valid filenames
         valid_filenames = [