[New Feature] Initial work on adding optional anthropic api base url

[isaiah-bernados]

I started work on this. It works when running locally with this as my VScode MCP Server config:

      "taskmaster-ai": {
        "command": "node",
        "args": [
          "~/src/github.com/ConsultingMD/agentoc-task-manager/mcp-server/server.js"
        ],
        "env": {}
      },

But currently, it hangs when it callse parse_prd, when it is supposedly calling bedrock.

[isaiah-bernados]

This works, just blocked by: eyaltoledano#475