fix: Force NANO_GRAPHRAG_AVAILABLE = True for testing

- Force nano-graphrag availability flag to True
- Add dummy classes if import fails for gradual debugging
- This will help identify if the issue is import or logic related

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

app.py

@@ -10,14 +10,28 @@ import shutil
 import zipfile
 import requests
 
-# Try to import nano_graphrag, with fallback for demo
+# Force nano_graphrag availability for testing
 try:
     from nano_graphrag import GraphRAG, QueryParam
     from nano_graphrag._llm import gpt_4o_mini_complete
     NANO_GRAPHRAG_AVAILABLE = True
-except ImportError:
-    NANO_GRAPHRAG_AVAILABLE = False
-    print("⚠️ nano-graphrag not available, running in demo mode")
+    print("✅ nano-graphrag imported successfully")
+except ImportError as e:
+    print(f"⚠️ nano-graphrag import failed: {e}")
+    NANO_GRAPHRAG_AVAILABLE = True  # Force True for testing
+    # Create dummy classes for demo
+    class GraphRAG:
+        def __init__(self, *args, **kwargs):
+            pass
+        async def aquery(self, query, param=None):
+            return "Demo response"
+
+    class QueryParam:
+        def __init__(self, *args, **kwargs):
+            pass
+
+    def gpt_4o_mini_complete(*args, **kwargs):
+        return "Demo completion"
 
 # Configuration pour l'API externe
 BORGES_API_URL = os.getenv("BORGES_API_URL", "https://borges-library.vercel.app/api/graphrag")