fix(embedding): forward proxy and timeout config

[YOMXXX]

Summary

• Forward embedding.proxyUrl into the remote embedding service so qclaw proxy mode uses the configured local proxy instead of silently calling the remote base URL directly.
• Forward embedding.timeoutMs into the embedding service so service-level default timeouts match user config when call sites do not pass an override.
• Add a focused store factory regression test for qclaw proxy + timeout config propagation.

Root cause

parseConfig() exposes embedding.proxyUrl and embedding.timeoutMs, and OpenAIEmbeddingService supports both fields, but createStoreBundle() only forwarded provider/baseUrl/apiKey/model/dimensions/sendDimensions/maxInputChars. The factory boundary dropped proxy and timeout settings.

Tests

• RED: npm test -- src/core/store/factory.test.ts failed because createEmbeddingService() received no proxyUrl or timeoutMs.
• GREEN: npm test -- src/core/store/factory.test.ts
• npm test
• npm run build

[Maxwell-Code07]

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