Add /api/mcp/call endpoint

feat: add /api/sandbox/test and /api/vault/push stub endpoints

Optimize connection lifecycle to load incrementally, and fix NVIDIA model in research route

Refactor loadAndConnectServers to load all sub-servers in parallel to avoid timeout blocks

Implement Super-MCP Aggregator Gateway and Auto-Parsing Registry

Implement research API endpoint with Exa AI and static fallback

Fix MCP Server import path to use index.js

Add Hugging Face Space metadata config frontmatter to README

Initialize SSE MCP Host