Polish a draft message in the requested tone.

Rewrites the user's draft message according to the requested tone while preserving meaning, intent, and any technical terms. In the Nurama web app this backs the chat composer's "Polish with Nu" button. Returns the rewritten text plus the credits actually billed and the workspace's balance after deduction. Caps: - `text` is capped at 4000 characters (~1000 input tokens). - Output is capped at ~600 tokens server-side. If the workspace has an `aiCustomPreprompt` configured it is prepended as additional system context (workspace-specific guidance to the model).

curl -X POST "https://example.com/ai/polish" \  -H "Content-Type: application/json" \  -d '{    "workspaceId": "ef0efa32-d1c1-43d4-a5e2-fe7b4f00403c",    "text": "string",    "toneId": "professional"  }'

{  "polishedText": "Could you please send me the file when you have a moment? Thank you.",  "billedCredits": 3,  "balanceAfter": 9997,  "eventId": "0193e4a1-b2c3-7000-8000-00000000abcd"}