Refactor Dockerfile and migration scripts: update Dockerfile to use Python slim image, streamline environment variable settings, and enhance permissions handling. Modify migrate.py to improve module path management and error handling, and update run.sh for better directory structure and debugging output.

Refactor application imports and migration script: update model import paths in env.py and migrate.py, enhance app initialization in __init__.py, and modify PYTHONPATH in run.sh for improved directory structure.

Update Alembic configuration and migration scripts: change script location and version path in alembic.ini, add env.py for migration management, create initial migration script for audiobooks table, and implement migration execution in a new migrate.py script.

Update Dockerfile and application imports: modify PYTHONPATH in Dockerfile and run script to include additional app directory, enhance model imports in audiobook_routes.py and migrations/env.py, and add missing imports in main.py.

Enhance Dockerfile and application structure: set PYTHONPATH in Dockerfile and run script, add __init__.py to app package, and improve model import error handling in migrations/env.py.

Update migration environment and run script: import additional models in env.py, enhance run.sh to create storage directories and initialize SQLite database with alembic migrations.

Update requirements and clean up run script: add alembic and SQLAlchemy dependencies, and remove unnecessary permission commands from the run script.

Refactor Dockerfile and add run script: streamline multi-stage build, set up application structure, and create a new run script for environment initialization and database migration; update migrations/env.py for improved error handling during model import.