Changed the celery entrypoint to include a warning if CELERY_NICE_LEVEL is negative AND SYS_NICE is not configured (SYS_NICE is required for negative levels)
- docker-compose: added service health checks
- dockerfile: added if logic for sed command so missing files do not cause build fail
- entrypoint.celery: change migration detection to not continue until ALL migrations are applied
- entrypoint: trim django key and change external postgres check to python in case postgres binaries are missing
- docker/entrypoint.sh: Conditional PostgreSQL init/startup for modular mode
- docker/entrypoint.celery.sh: New dedicated entrypoint for celery container - prevents race condition in modular deployment
- docker/uwsgi.modular.ini: New uWSGI config without Redis/Celery daemons
- docker/Dockerfile: Add line ending fixes and chmod for entrypoints - adds cross-platform support for image builds
- docker/docker-compose.yml: Configure modular mode with DISPATCHARR_ENV - uses new celery entrypoint and adds depends_on to prevent race condition
