Update a single project setting

Updates one key of the project's `settings` JSON column. Mirrors the workspace settings endpoint. Requires `canManageProjectSettings` (no subscription check on this route). At the project level every setting accepts `null`, meaning "inherit the workspace's value". Otherwise the type of `value` depends on `name`: - `allowAiFeatures`, `aiPolishEnabled`, `aiComposeEnabled`, `aiChatEnabled`, `aiAssistEnabled`, `aiTaskGenerationEnabled`, `aiImageRevisionEnabled`, `aiPolishAllowReviewer`, `aiComposeAllowReviewer`, `aiChatAllowReviewer`, `aiAssistAllowReviewer`, `aiTaskGenerationAllowReviewer`, `aiImageRevisionAllowReviewer` — boolean. - `aiAssistFollowUpWindow` — integer, 0–30. - `aiCustomPreprompt`, `aiTaskGenerationPreprompt` — string (may be empty; empty means "no preprompt", null means inherit). - `aiChatTools`, `aiAssistTools` — object mapping tool names (`^[a-z][a-z0-9_]*$`) to boolean or null. A `value` of the wrong type for the setting is a validation error (400).

curl -X PATCH "https://example.com/projects/497f6eca-6276-4993-bfeb-53cbbbba6f08/settings/allowAiFeatures" \  -H "Content-Type: application/json" \  -d '{    "value": null  }'

{  "id": "497f6eca-6276-4993-bfeb-53cbbbba6f08",  "workspaceId": "ef0efa32-d1c1-43d4-a5e2-fe7b4f00403c",  "name": "string",  "slug": "string",  "color": "string",  "logo": "3c06f846-1ab1-40a9-8645-a19a9fdeae85",  "settings": {},  "status": "active",  "createdAt": 1678886400000,  "updatedAt": 1678886400000}