chore: Update Aptfile and optimize database connection settings

Commit notes

- Added libvpx7 and libopus0 to the Aptfile for enhanced audio processing capabilities. - Adjusted database connection pool settings to improve resource management, reducing max idle connections to 4 and max open connections to 10, with a connection lifetime of 30 minutes. - Enhanced ffmpeg integration by applying environment variables for shared library paths in audio conversion functions, ensuring better compatibility across different environments.