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>

migrations/versions/029_add_user_language_preference.py

@@ -0,0 +1,40 @@
+"""Add preferred_language column to user_profiles for i18n support.
+
+Revision ID: 029_add_user_language_preference
+Revises: 028_add_audit_logs
+Create Date: 2026-03-09
+"""
+
+from typing import Union
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "029_add_user_language_preference"
+down_revision: Union[str, None] = "028_add_audit_logs"
+depends_on: Union[str, None] = None
+
+
+def upgrade() -> None:
+    """Add preferred_language column to user_profiles table."""
+    conn = op.get_bind()
+    inspector = sa.inspect(conn)
+    if "user_profiles" not in inspector.get_table_names():
+        return
+    existing_columns = {col["name"] for col in inspector.get_columns("user_profiles")}
+    if "preferred_language" not in existing_columns:
+        op.add_column(
+            "user_profiles",
+            sa.Column("preferred_language", sa.String(10), nullable=True, server_default=None),
+        )
+
+
+def downgrade() -> None:
+    """Remove preferred_language column from user_profiles table."""
+    conn = op.get_bind()
+    inspector = sa.inspect(conn)
+    if "user_profiles" not in inspector.get_table_names():
+        return
+    existing_columns = {col["name"] for col in inspector.get_columns("user_profiles")}
+    if "preferred_language" in existing_columns:
+        op.drop_column("user_profiles", "preferred_language")