[DOC] Add Windows development setup guide and fix mysqlclient installation

## Problem
The current documentation does not cover Windows-specific
setup issues. Contributors on Windows face multiple blockers:

1. `mysqlclient` fails to build without Microsoft C++ Build Tools
2. No mention of `docker-compose.yaml` (vs .yml) filename
3. No Windows-specific instructions in CONTRIBUTING docs

## Proposed Solution
- Add a Windows setup section to the contributing guide
- Document the mysqlclient fix for Windows
- Clarify correct docker compose commands for Windows

## Environment
- OS: Windows 11
- Python: 3.14
- Docker: 29.2.1