* feat(embeddings): add openrouter provider type definitions
* feat(embeddings): implement OpenRouterProvider
* feat(embeddings): export openrouter provider package symbols
* feat(embeddings): register openrouter in allowed embedding providers
* feat(embeddings): register openrouter provider and overloads in factory
* feat(tools): add openrouter embedding service support
* test(embeddings): add comprehensive openrouter provider and factory tests
* test(embeddings): add openrouter build test in embedding factory
* test(embeddings): add openrouter model key alias and env tests
* test(tools): add openrouter tests for embedding service
* docs: add openrouter embedder configuration example
* docs(ar): sync openrouter embedder translation
* docs(ko): sync openrouter embedder translation
* docs(pt-BR): sync openrouter embedder translation
* feat(embeddings): allow model alias and None fields in OpenRouterProviderConfig
* fix(tools): resolve EMBEDDINGS_OPENROUTER_API_KEY before OPENROUTER_API_KEY
* test(tools): add regression tests for openrouter env var precedence and fallback
* feat(embeddings): drop organization_id and resolve api_key via OPENROUTER_API_KEY only
* fix(tools): use OPENROUTER_API_KEY in embedding service and update tests
* docs: switch openrouter knowledge example to model_name and document OPENROUTER_API_KEY
* fix(tools): default openrouter model to namespaced openai/text-embedding-3-small
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Co-authored-by: Vidit Ostwal <110953813+Vidit-Ostwal@users.noreply.github.com>
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