[Feature Request]: Add repo metadata to the internal docs MCP server's tool responses

### Prerequisites

- [x] I have searched existing issues to ensure this feature hasn't already been requested
- [x] I have tested using the latest version of docs-builder

### What problem are you trying to solve?

When accessing the internal docs via MCP it is unknown where those docs are deployed from. This makes it more difficult to track down the source of the docs. Also, it would be useful to LLMs so they could look at the repo for more context.

### Proposed Solution

For the internal docs MCP responses like `get_internal_document_by_url`, `search_internal_docs`, `find_related_internal_docs` the source repo is returned so the LLM can answer about where the docs are sourced from and can follow up in that repo for more context.

### Examples and Research

_No response_

### Alternative Solutions

_No response_

### Additional Context

_No response_

### How important is this feature to you?

Important