(feature request) vala language support

### What problem does this solve?

Hello. It would be nice if this MCP server could be used with Vala-based projects.

Here is the official website: https://vala.dev/

### Proposed solution

The MCP server is extended to support the vala programming language.

### Alternatives considered

_No response_

### Confirmations

- [x] I searched existing issues and this is not a duplicate.