feat: add config profiles data model and migrations

- Add ConfigProfile model with user ownership, name, description
- Add ConfigInclude model for ordered profile self-references
- Add ConfigMount model for mount/file definitions
- Add selected_profile_id to ToolInstance for per-instance profile selection
- Add default profile properties to UserConfig JSONB config
- Create Alembic migration 0013 for new tables and columns
- Register new models in models/__init__.py
- Mark config_folders.is_active as deprecated
- Add migration metadata test

Quality gates: syntax check passed (all files parse successfully)
OpenSpec: add-config-profiles task 1.1

apps/api/tests/unit/test_migration_metadata.py

@@ -39,3 +39,18 @@ def test_refresh_tokens_migration_has_expected_revision_chain() -> None:
 
     assert module.revision == "0002_refresh_tokens"
     assert module.down_revision == "0001_initial_schema"
+
+
+@pytest.mark.unit
+def test_config_profiles_migration_has_expected_revision_chain() -> None:
+    migration_path = Path(__file__).resolve().parents[2] / "alembic" / "versions" / "0013_add_config_profiles.py"
+    spec = spec_from_file_location("add_config_profiles", migration_path)
+
+    assert spec is not None
+    assert spec.loader is not None
+
+    module = module_from_spec(spec)
+    spec.loader.exec_module(module)
+
+    assert module.revision == "0013_add_config_profiles"
+    assert module.down_revision == "0012_default_port_req"