Add posthog MCP tracking

[Code42Cate]

Note

Adds mcp to NewSandbox API and handlers, and records mcp_servers in PostHog when creating sandboxes.

• API/OpenAPI:
  • Introduces Mcp schema and adds mcp field to NewSandbox in spec/openapi.yml.
  • Regenerates packages/api/internal/api/spec.gen.go, types.gen.go, and test models to include type Mcp and NewSandbox.Mcp.
• Handlers:
  • startSandbox now accepts an mcp argument; PostSandboxes reads body.Mcp and passes it; PostSandboxesSandboxIDResume passes nil.
  • Adds PostHog property mcp_servers (keys of mcp) to the created_instance event using maps.Keys/slices.Collect.

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