ORT WASM artifact sync

Trap: changing the ONNX Runtime Web artifact list only in bundle.ts looks sufficient because bundling may still succeed, but runtime lookup or npm packaging can omit the required local WASM variant and fall back to the wrong CDN asset. Fix: keep bundle.ts copies, packages/gateway/package.json files, and embedding-worker.ts sibling-path configuration synchronized for both ort-wasm-simd-threaded.mjs and .wasm.