Add Bot Service Taskfile Commands

[tgrunnagle]

Closes #101

Summary

Adds Taskfile commands for running the Bot Service, completing the infrastructure setup for the "Add Bots to End-User Games" feature. This enables developers to easily start the service in both production and development modes.

Changes Made

Taskfile.yml

• Added bot2:service task to run the Bot Service via uv run python -m bot.service
• Added bot2:service:dev task with auto-reload for development using uvicorn's --reload flag
• Both tasks include bot2:install as a dependency to ensure packages are installed

Testing

• Verify with task bot2:service - service starts on default port 8080
• Verify with task bot2:service:dev - service starts with hot-reload enabled
• Health check: curl http://localhost:8080/health returns {"status": "healthy"}

Additional Notes

• Dependencies (fastapi>=0.115.0, uvicorn>=0.34.0) were already added to bot2/pyproject.toml in a previous PR
• This is the final task in the "Add Bots to End-User Games" epic (Epic: Add Bots to End-User Games #95)
• Service respects environment variables: BOT_SERVICE_PORT, BOT_SERVICE_HOST, GAME_SERVER_HTTP_URL, GAME_SERVER_WS_URL