Add hostname and server type to mcp req

[dimitriosGX]

Summary by cubic

Add hostname to MCP submit requests and set explicit stdio type for local servers. This lets the backend approve stdio servers per machine and removes the need to infer transport.

• New Features
  • SubmitRequest includes hostname; request body sends "hostname".
  • Daemon populates hostname via platform::hostname() (env vars, then hostname command).
  • For stdio configs, request body sets "type": "stdio"; tests updated accordingly.

^{Written for commit b2f524f. Summary will update on new commits.}

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[cubic-dev-ai]

No issues found across 3 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}