Openrouter-x-Ollama

# Feature Request: OpenRouter & Ollama LLM Provider Support

## Summary
Add support for OpenRouter and Ollama as LLM provider options.

## Rationale
- **OpenRouter** provides access to multiple model providers through a single API
- **Ollama** enables local LLM inference without external dependencies

## Current Workarounds
None identified.

## Contribution
Willing to submit a PR.
