Fix OAuth redirect URI for HF Spaces

- Convert SPACE_ID format for proper domain construction
- Use holistic-ai-agentgraph.hf.space format for redirect URIs
- Fix both login and callback redirect URI generation
- Ensure OAuth flow works correctly in HF Spaces environment

backend/routers/auth.py

@@ -68,6 +68,16 @@ async def login(request: Request):
     
     # Get the current host for redirect URI
     base_url = str(request.base_url).rstrip('/')
+    
+    # Fix for HF Spaces domain format
+    if is_huggingface_space():
+        # HF Spaces uses holistic-ai-agentgraph.hf.space format
+        space_id = os.getenv("SPACE_ID", "")
+        if space_id:
+            # Convert "holistic-ai/AgentGraph" to "holistic-ai-agentgraph.hf.space"
+            space_domain = space_id.replace("/", "-").lower()
+            base_url = f"https://{space_domain}.hf.space"
+        
     redirect_uri = f"{base_url}/auth/callback"
     
     # Build authorization URL
@@ -102,6 +112,14 @@ async def oauth_callback(request: Request, code: str, state: str):
     
     # Exchange code for tokens
     base_url = str(request.base_url).rstrip('/')
+    
+    # Fix for HF Spaces domain format
+    if is_huggingface_space():
+        space_id = os.getenv("SPACE_ID", "")
+        if space_id:
+            space_domain = space_id.replace("/", "-").lower()
+            base_url = f"https://{space_domain}.hf.space"
+            
     redirect_uri = f"{base_url}/auth/callback"
     
     try: