return user pronunciation feedback

An interesting idea for tech enthusiasts that would generate a lot of value for new subscribers would be to add artificial intelligence and speech-to-text to analyze the user's pronunciation. It should return scores and points for pronunciation improvement.

No files, tests, or entry points are named. Start by surveying the TypeScript project to find how user audio and pronunciation results are currently handled, then define the speech-to-text and scoring scope. Done should include an agreed implementation path for returning pronunciation feedback and points.

Written by the indexing model from the issue text.