feat: Add DISPATCHARR_ENV=modular support for multi-container deployments

- 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

docker/uwsgi.modular.ini

@@ -0,0 +1,59 @@
+[uwsgi]
+; Modular deployment mode - external PostgreSQL, Redis, and Celery
+; Remove file creation commands since we're not logging to files anymore
+; exec-pre = mkdir -p /data/logs
+; exec-pre = touch /data/logs/uwsgi.log
+; exec-pre = chmod 666 /data/logs/uwsgi.log
+
+; First run Redis availability check script once
+exec-pre = python /app/scripts/wait_for_redis.py
+
+; Start Daphne for WebSocket support (required for real-time features)
+; Redis and Celery run in separate containers in modular mode
+attach-daemon = daphne -b 0.0.0.0 -p 8001 dispatcharr.asgi:application
+
+# Core settings
+chdir = /app
+module = dispatcharr.wsgi:application
+virtualenv = /dispatcharrpy
+master = true
+env = DJANGO_SETTINGS_MODULE=dispatcharr.settings
+env = USE_NGINX_ACCEL=true
+socket = /app/uwsgi.sock
+chmod-socket = 777
+vacuum = true
+die-on-term = true
+static-map = /static=/app/static
+
+# Worker management
+workers = 4
+
+# Optimize for streaming
+http = 0.0.0.0:5656
+http-keepalive = 1
+buffer-size = 65536  # Increase buffer for large payloads
+post-buffering = 4096  # Reduce buffering for real-time streaming
+http-timeout = 600  # Prevent disconnects from long streams
+socket-timeout = 600  # Prevent write timeouts when client buffers
+lazy-apps = true  # Improve memory efficiency
+
+# Async mode (use gevent for high concurrency)
+gevent = 400  # Each unused greenlet costs ~2-4KB of memory
+# Higher values have minimal performance impact when idle, but provide capacity for traffic spikes
+# If memory usage becomes an issue, reduce this value
+
+# Performance tuning
+thunder-lock = true
+log-4xx = true
+log-5xx = true
+disable-logging = false
+
+# Logging configuration
+# Enable console logging (stdout)
+log-master = true
+# Enable strftime formatting for timestamps
+logformat-strftime = true
+log-date = %%Y-%%m-%%d %%H:%%M:%%S,000
+# Use formatted time with environment variable for log level
+log-format = %(ftime) $(DISPATCHARR_LOG_LEVEL) uwsgi.requests Worker ID: %(wid) %(method) %(status) %(uri) %(msecs)ms
+log-buffering = 1024  # Add buffer size limit for logging