Funding and workspace improvements

Funding Invoice Status

• All funding endpoints now include a status field indicating the current state of the funding invoice
• Possible values: opened, processing, funded, canceled
• Automatically updated by the system as transfers are processed

Workspace Fee Configuration

• Workspace endpoints now expose funding fee configuration:
  • funding_fee_percent - The fee percentage charged for funding operations
  • additive_funding_fee - Whether the fee is added to or deducted from the funding amount

Cancel Funding Invoice

• New Endpoint: POST /api/rest/funding/{id}/cancel
• Allows canceling a funding invoice via the REST API
• Returns the updated funding object with status: "canceled"

Funding Invoice PDF URL

• New Endpoint: GET /api/rest/funding/{id}/pdf-url
• Generates and returns a URL to download the funding invoice PDF
• Returns: { "url": "https://..." }