Add support for vector store files endpoints

[Sameerlite]

Title

Add support for vector store files endpoints

Relevant issues

Pre-Submission checklist

Please complete all items before asking a LiteLLM maintainer to review your PR

• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• I have added a screenshot of my new test passing locally
• My PR passes all unit tests on make test-unit
• My PR's scope is as isolated as possible, it only solves 1 specific problem

Type

🆕 New Feature

Changes

• Added reusable BaseVectorStoreFilesConfig plus OpenAI implementation and typed request/response models so providers can translate vector store file operations consistently.
• Wired new SDK entrypoints (create, list, retrieve, content, update, delete) through vector_store_files/main.py, extending the shared HTTP handler for both sync and async workflows.
• Introduced FastAPI proxy routes for file management, including credential hydration and permission checks aligned with managed vector store registries.
• Enhanced router support, route mappings, and permission utilities (with placeholder-aware matching) so proxy and Router APIs expose the new endpoints safely.
• Added focused unit tests covering OpenAI transformations, router wiring, and permission gating for vector store file flows.

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Project	Deployment	Preview	Comments	Updated (UTC)
litellm	Error			Nov 11, 2025 3:50pm