feat: Add langgraph.json configuration file for graph management and environment setup

langgraph.json

@@ -0,0 +1,11 @@
+{
+    "dockerfile_lines": [],
+    "graphs": {
+      "enhanced_video_archive": "./pstuts_rag/pstuts_rag/graph.py:graph"
+    },
+    "python_version": "3.11",
+    "env": "./.env",
+    "dependencies": [
+      "."
+    ]
+  }