refactor: rename enableMetaApi to enableServicesApi

[pyramation]

Summary

Renames enableMetaApi to enableServicesApi across the codebase to better reflect the purpose of this option - it controls whether the services API (domain/subdomain routing via services_public) is enabled.

Changes:

• Renamed enableMetaApi → enableServicesApi in ApiOptions interface (graphql/types)
• Renamed API_ENABLE_META → API_ENABLE_SERVICES environment variable (graphql/env)
• Renamed --metaApi → --servicesApi CLI flag (packages/cli)
• Updated middleware check in graphql/server
• Updated all documentation and tests

Review & Testing Checklist for Human

• Breaking change: Verify any existing deployments using API_ENABLE_META env var or enableMetaApi config option are updated to use the new names
• Verify the CLI --servicesApi flag works correctly: cnc server --no-servicesApi should prompt for schema selection
• Confirm the snapshot update includes an unrelated errorOutput field - this was a pre-existing change that needed syncing, not part of this rename

Test plan:

1. Run cnc server --help and verify --servicesApi appears in the help text
2. Run cnc server --no-servicesApi and verify it prompts for schema selection
3. Set API_ENABLE_SERVICES=false env var and verify the server starts without services API

Notes

• Link to Devin run: https://app.devin.ai/sessions/a583a9da700a4feca3985c559d33e51f
• Requested by: Dan Lynch (@pyramation)

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