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>

app/utils/filename_utils.py

@@ -8,6 +8,11 @@ from pathlib import Path
 
 logger = logging.getLogger(__name__)
 
+# Pattern for valid filenames (alphanumeric, dash, underscore, period, and space)
+# Used for validating GPT-provided filenames and other inputs
+VALID_FILENAME_PATTERN = r"^[\w\-\. ]+$"
+VALID_FILENAME_RE = re.compile(VALID_FILENAME_PATTERN)
+
 
 def get_unique_filename(original_path: str, check_exists_func: Callable[[str], bool] | None = None) -> str:
     """