Add Gunicorn config for Render deployment

backend/gunicorn_config.py

@@ -0,0 +1,44 @@
+"""Gunicorn configuration for Render deployment."""
+import os
+import multiprocessing
+
+# Bind to the port Render provides
+bind = f"0.0.0.0:{os.getenv('PORT', '10000')}"
+
+# Use uvicorn workers
+worker_class = "uvicorn.workers.UvicornWorker"
+
+# Single worker for memory efficiency on free tier
+workers = 1
+
+# Timeout for slow startup (10 minutes to allow for model loading)
+timeout = 600
+
+# Graceful timeout
+graceful_timeout = 30
+
+# Keepalive
+keepalive = 5
+
+# Logging
+accesslog = "-"
+errorlog = "-"
+loglevel = os.getenv("LOG_LEVEL", "info").lower()
+
+# Preload app (set to False for faster startup if needed)
+preload_app = True
+
+
+def on_starting(server):
+    """Called just before the master process is initialized."""
+    print(f"[GUNICORN] Starting on {bind}", flush=True)
+
+
+def on_reload(server):
+    """Called when worker is reloaded."""
+    print(f"[GUNICORN] Reloading workers", flush=True)
+
+
+def when_ready(server):
+    """Called just after the server is started."""
+    print(f"[GUNICORN] Server is ready. Accepting connections.", flush=True)