Fix Railway deployment path: use absolute paths and uv run

- Use absolute path /app/mcp_server in deploy command
- Switch to uv run for automatic virtual environment handling
- Eliminates cd command failures in Railway deployment environment

🤖 Generated with [Claude Code](https://claude.ai/code)

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

railway.json

@@ -4,7 +4,7 @@
     "buildCommand": "cd mcp_server && uv sync"
   },
   "deploy": {
-    "startCommand": "cd mcp_server && python graphiti_mcp_server.py --transport sse --host 0.0.0.0 --port 8080",
+    "startCommand": "cd /app/mcp_server && uv run graphiti_mcp_server.py --transport sse --host 0.0.0.0 --port 8080",
     "restartPolicyType": "on_failure",
     "restartPolicyMaxRetries": 10
   }