Fix port precedence: respect config.json over hardcoded defaults

gunicorn.conf.py

@@ -2,7 +2,7 @@ import multiprocessing
 
 # Bind address — change to a Unix socket for nginx proxy:
 #   bind = 'unix:/tmp/magic.sock'
-bind = '0.0.0.0:5000'
+# bind = '0.0.0.0:5000'
 
 # One worker per CPU core, +1.  Keep at 2 minimum for SQLite (WAL mode handles
 # concurrent reads; writes are serialised at the SQLite layer).

production.py

@@ -237,9 +237,9 @@ def _build_parser() -> argparse.ArgumentParser:
     sub.required = True
 
     def _add_server_args(p: argparse.ArgumentParser) -> None:
-        p.add_argument('--host',    default='0.0.0.0', metavar='HOST',
+        p.add_argument('--host',    default=None, metavar='HOST',
                        help='Bind address (default: 0.0.0.0)')
-        p.add_argument('--port',    default=5000, type=int, metavar='PORT',
+        p.add_argument('--port',    default=None, type=int, metavar='PORT',
                        help='Bind port (default: 5000)')
         p.add_argument('--workers', default=None, type=int, metavar='N',
                        help='Worker processes (default: cpu_count + 1, min 2)')
@@ -283,16 +283,8 @@ def main() -> None:
     # args.host and args.port always have values because of 'default' in ArgumentParser.
     # We'll re-parse or check the sys.argv.
     
-    host    = default_host
-    port    = default_port
-    
-    # Simple check: if '--host' or '--port' is in sys.argv, use the arg value.
-    # Otherwise, use the config value.
-    if '--host' in sys.argv:
-        host = args.host
-    if '--port' in sys.argv:
-        port = args.port
-        
+    host    = args.host or default_host or '0.0.0.0'
+    port    = args.port or default_port or 5000
     workers = getattr(args, 'workers', None) or default_workers
 
     if args.command == 'start':