Fix worker crash: remove broken gunicorn post_fork hook

Co-authored-by: Cursor <cursoragent@cursor.com>

app/routes.py

@@ -2,6 +2,7 @@ import os
 
 from flask import (
     Blueprint,
+    Response,
     abort,
     current_app,
     flash,
@@ -21,6 +22,7 @@ from app.models import Folder, Photo
 from app.settings_service import get_settings
 from app.storage_service import delete_photo_file, get_photo_stream
 from app.upload_service import process_uploads
+from sqlalchemy import text
 
 bp = Blueprint("main", __name__)
 
@@ -28,10 +30,12 @@ bp = Blueprint("main", __name__)
 @bp.route("/health")
 def health():
     try:
-        db.session.execute(db.text("SELECT 1"))
-        return {"status": "ok"}, 200
+        db.session.execute(text("SELECT 1"))
+        db.session.remove()
+        return Response("ok\n", mimetype="text/plain")
     except Exception as exc:
-        return {"status": "error", "detail": str(exc)}, 503
+        db.session.remove()
+        return Response(f"error: {exc}\n", status=503, mimetype="text/plain")
 
 
 @bp.route("/")