@cardano402/mcp-server missing spending limits, LAN-exposed HTTP transport, and SSRF via catalog.server.url
## Summary `@cardano402/mcp-server` versions `<= 0.1.1` ship three security gaps that can lead to unauthorized fund movement when the package is used as designed (an MCP server exposing Cardano payment tools to an ## Impact ### 1. No spending limits on signed payments An LLM (or prompt-injected LLM) calling tools registered by the MCP server can invoke them in a loop. Each call signs a real Cardano transaction for the catalog-advertised amount. There is no per-call cap, daily ceiling, MCP elicitation/confirmation step, or recipient allowlist. The `MAINNET=true` env-var guardrail can be bypassed by any LLM with shell-tool access. Worst case:
- Actualiza a 0.1.2
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