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/versions/028_add_audit_logs.py

@@ -0,0 +1,47 @@
+"""Add audit_logs table for comprehensive compliance audit logging.
+
+Revision ID: 028_add_audit_logs
+Revises: 027_ensure_shared_links_table
+Create Date: 2026-03-09
+"""
+
+from typing import Union
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "028_add_audit_logs"
+down_revision: Union[str, None] = "027_ensure_shared_links_table"
+depends_on: Union[str, None] = None
+
+
+def upgrade() -> None:
+    """Create audit_logs table."""
+    op.create_table(
+        "audit_logs",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("timestamp", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
+        sa.Column("user", sa.String(), nullable=False),
+        sa.Column("action", sa.String(), nullable=False),
+        sa.Column("resource_type", sa.String(), nullable=True),
+        sa.Column("resource_id", sa.String(), nullable=True),
+        sa.Column("ip_address", sa.String(), nullable=True),
+        sa.Column("details", sa.Text(), nullable=True),
+        sa.Column("severity", sa.String(16), nullable=False, server_default="info"),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_index("ix_audit_logs_id", "audit_logs", ["id"])
+    op.create_index("ix_audit_logs_timestamp", "audit_logs", ["timestamp"])
+    op.create_index("ix_audit_logs_user", "audit_logs", ["user"])
+    op.create_index("ix_audit_logs_action", "audit_logs", ["action"])
+    op.create_index("ix_audit_logs_resource_type", "audit_logs", ["resource_type"])
+
+
+def downgrade() -> None:
+    """Drop audit_logs table."""
+    op.drop_index("ix_audit_logs_resource_type", "audit_logs")
+    op.drop_index("ix_audit_logs_action", "audit_logs")
+    op.drop_index("ix_audit_logs_user", "audit_logs")
+    op.drop_index("ix_audit_logs_timestamp", "audit_logs")
+    op.drop_index("ix_audit_logs_id", "audit_logs")
+    op.drop_table("audit_logs")