v4.6.1

Changed

• Split the model registries, pricing, and voice catalog out of server.mjs into data/*.mjs (#46): registry-image.mjs, registry-video.mjs, registry-audio.mjs, pricing.mjs, voices.mjs. server.mjs shrank from ~5480 to ~2740 lines and imports (and re-exports) them, so model-catalog PRs are now reviewable data diffs instead of edits buried in one huge file. Behavior is byte-identical — tools/list and list_models output verified unchanged before/after, all 32 unit tests pass, and the modules are added to the npm files list so they ship with the package. No functional change.