feat: integrate flask-orjson for improved JSON serialization performance (#23935)

api/extensions/ext_orjson.py

@@ -0,0 +1,8 @@
+from flask_orjson import OrjsonProvider
+
+from dify_app import DifyApp
+
+
+def init_app(app: DifyApp) -> None:
+    """Initialize Flask-Orjson extension for faster JSON serialization"""
+    app.json = OrjsonProvider(app)