Fix Python 3.13 audio installation on Windows

[pauloacribeiro92]

Summary

• remove the unmaintained simpleaudio dependency that fails to build on Python 3.13
• play the downloaded WAV response through the project's existing PyAudio dependency
• keep audio data in memory instead of writing a misleading output.mp3 file
• add an HTTP timeout and propagate failed downloads before playback starts
• add regression tests for successful playback cleanup and failed downloads

Validation

• python -m unittest discover -s tests: passed
• regression coverage verifies WAV metadata is passed to PyAudio, frames are written, and stream/player resources are always closed
• regression coverage verifies HTTP failures stop before audio initialization
• all changed Python files compile successfully
• installation no longer attempts to build simpleaudio on Windows/Python 3.13

AI assistance

OpenAI GPT-5.6 Thinking assisted with repository inspection, implementation, and test drafting. Paulo Ribeiro reviewed the scope and remains responsible for the contribution.

Fixes #5