feat: Integrate AI SDK for enhanced audio analysis and copy generation

Commit notes

- Added dependencies for @ai-sdk/openai and ai to package.json and bun.lock. - Refactored AI copywriting and tagging services to utilize the new SDK directly, removing dynamic imports. - Updated model references in AI services to use the latest versions for improved performance. - Introduced a schema for LLM categorization in audio analysis to standardize responses.