fix(hip): 12 list-argument makers can't resolve a str enum name either #2394

Follow-up to #2356/#2393. _make_index's str-name resolution bug (an argument whose own default is None, so its enum namespace can't be inferred) was fixed in #2393 for the 5 sites listed in #2356 (hopopt/ipv6_opts's _make_opt_mpl/_make_opt_smf_dpd, httpv1's _make_start_line).

A wider AST scan during that fix found a separate 12-site family in pcapkit/protocols/internet/hip.py, same symptom but a different shape: the name is a loop variable over a list parameter (e.g. _make_param_dh_group_list(groups=['Group_384_bit_group'])), so _make_index_namespace's isinstance(value, str) check can't match the list. Confirmed broken by measurement: the member form of the same call builds the correct bytes, the string-name form raises ProtocolNotImplemented.

Affected makers: _make_param_dh_group_list, _make_param_hip_transform, _make_param_hip_cipher, _make_param_nat_traversal_mode, _make_param_hit_suite_list, _make_param_reg_info, _make_param_reg_request, _make_param_reg_response, _make_param_reg_failed, _make_param_transport_format_list, _make_param_esp_transform, _make_param_hip_transport_mode.

Not mechanical: of the 9 enums these need, 5 (Enum_Suite, Enum_NATTraversal, Enum_Registration, Enum_ESPTransformSuite, Enum_Transport) are currently imported only under TYPE_CHECKING in hip.py. Fixing this means promoting those imports to runtime — a real decision (possible import-cycle implications), not a one-line namespace=X if X is not None else Y patch.