docs: add integration guide and HTML test page

chore: add .dockerignore for cleaner Docker builds

docs: add README and deployment guide for audio service

feat: serve audio verification output files safely

feat: integrate full audio verification pipeline

feat: add audio verification report builder

feat: add audio trust scoring engine

feat: add audio inference and fake-real class mapping

feat: add Random Forest audio model loader with caching

feat: add exact 26-feature audio extraction pipeline

feat: add audio quality analysis signals

feat: add audio preprocessing and normalization

feat: add audio metadata analysis and duration policy

feat: add safe audio upload validation

chore: initialize BitCheck audio verification service