Add FinStudio Financial Models

[FinStudio-png]

Server: io.github.FinStudio-png/finstudio-financial-models
Repo: https://github.com/FinStudio-png/finstudio-mcp
URL: https://web-production-842e0.up.railway.app/sse
server.json: https://github.com/FinStudio-png/finstudio-mcp/blob/main/server.json

4 tools: tax_calculator, dcf_valuation, unit_economics, pnl_forecast
International tax consulting - Cyprus, UAE, Hong Kong, Estonia, Spain, Portugal, Malta, Ireland

[rdimitrov]

Closing as out of scope