refactor: remove NodeHttpAdapter in favor of @constructive-io/fetch

[pyramation]

Summary

Remove the redundant NodeHttpAdapter (which used node:http/node:https directly) from codegen and all generated SDKs. The ORM's FetchAdapter already uses createFetch() from @constructive-io/fetch, which handles *.localhost DNS rewriting and Host header preservation in Node.js automatically.

What changed:

• Deleted node-fetch.ts template and all 8 generated node-fetch.ts files
• Removed generateNodeFetchFile() from codegen utils
• Simplified executor generators to always use { endpoint, headers } — FetchAdapter handles the rest
• Fully removed nodeHttpAdapter option from ExecutorOptions, GenerateMultiTargetCliOptions, config types, and generateCreateClientFile
• Removed all config plumbing from generate.ts
• Updated all 4 SDK executor.ts files

External API unchanged — consumers still pass endpoint + headers to createClient.

Net: -1,766 lines.

Review & Testing Checklist for Human

• Verify createClient({ endpoint, headers }) works with *.localhost endpoints (e.g. auth.localhost:3000/graphql) — FetchAdapter handles DNS + Host header via @constructive-io/fetch
• Run cnc codegen on a project and confirm no node-fetch.ts files appear in cli/ or orm/ output
• Confirm generated executor.ts uses { endpoint, headers } instead of new NodeHttpAdapter(...)
• The graphql/orm-test suite (which runs codegen dynamically against a live PG) is the best integration test for this — it exercises runCodegenAndLoad end-to-end

Notes

• Follow-up from PR #1026 review
• The FindManyArgs template still has TOrderBy = never — can be a separate follow-up

Link to Devin session: https://app.devin.ai/sessions/7d04ac62fc67430aba0aaa40e044eb14
Requested by: @pyramation

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