Universal OpenAI Vector Store MCP Server

This is a test file for the Universal MCP Server Phase 2 implementation. The new file management tools include: 1. file-upload - Upload local files to OpenAI 2. file-list - List all uploaded files 3. file-get - Get file details 4. file-delete - Delete files 5. file-content - Download file content 6. upload-create - Create multipart uploads for large files This completes the end-to-end workflow: Upload file → Add to vector store → Search and retrieve Phase 2 successfully transforms the MCP server from "vector store management only" to "complete file-to-vector-store workflow" that users need in real-world scenarios.