fix: merge main into i18n branch and relink migration to 029

- Resolve conflict in app/api/__init__.py (keep both audit_logs_router and i18n_router)
- Incorporate AuditLog model, audit_service, audit_logs API/views from main
- Relink migration from 026→027 to 028→029 (chain after 028_add_audit_logs)
- Update migrations/env.py with full model import list from main

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

migrations/versions/029_add_user_language_preference.py

@@ -0,0 +1,28 @@
+"""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."""
+    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."""
+    op.drop_column("user_profiles", "preferred_language")