Revert preload_app: incompatible with PyPy + async workers

monkey.patch_all() fails in workers when the app is preloaded,
as existing locks from the loaded app cannot be patched on PyPy.
This affects both gevent and eventlet.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: vthorsteinsson

config/gunicorn_config.py

@@ -10,7 +10,7 @@
 worker_class = "gevent"
 workers = 4
 timeout = 120
-preload_app = True
+# Note: preload_app is not compatible with PyPy + async workers (gevent/eventlet)
 max_requests = 1000
 max_requests_jitter = 50