GET /api/companies/{companyId}/secrets
POST /api/companies/{companyId}/secrets { "name": "anthropic-api-key", "value": "sk-ant-..." }
PATCH /api/secrets/{secretId} { "value": "sk-ant-new-value..." }
"version": "latest"
{ "env": { "ANTHROPIC_API_KEY": { "type": "secret_ref", "secretId": "{secretId}", "version": "latest" } } }