Thread compile_time_info through webpack path to eliminate hardcoded node_env strings
Extract node_env_from_compile_time_info() as a shared helper in parse.rs and use it
from both EcmascriptModuleAsset::parse() and the webpack analysis path. Thread
compile_time_info through WebpackModuleAsset, WebpackChunkAssetReference,
WebpackEntryAssetReference, WebpackRuntimeAssetReference, webpack_runtime(), and
module_references() so that SWC plugin transforms on webpack bundles also see the
correct NODE_ENV. Add a comment in segment_config.rs explaining why the node_env
value is irrelevant there (EcmascriptInputTransforms::empty() = no transforms run).
Co-Authored-By: Claude <noreply@anthropic.com>