Fix Railway port configuration: explicitly force port 8080

PROBLEM:
MCP server was using port 8000 despite PORT=8080 being set in Railway.
Environment variable wasn't being read correctly by the Python process.

SOLUTION:
- Set PORT=8080 in start command environment
- Add explicit --port 8080 command argument
- Double enforcement ensures port 8080 is used

EXPECTED RESULT:
- MCP server will start on port 8080 (not 8000)
- Railway load balancer can route traffic correctly
- SSE endpoint accessible for ChatGPT at /sse
- No more 502 errors

🚀 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 && uv run graphiti_mcp_server.py --transport sse --host 0.0.0.0",
+    "startCommand": "cd mcp_server && PORT=8080 uv run graphiti_mcp_server.py --transport sse --host 0.0.0.0 --port 8080",
     "restartPolicyType": "on_failure",
     "restartPolicyMaxRetries": 10
   }