Add additional organization billing information to the Svelte billing settings

[Copilot]

Organizations can now store additional billing details needed for invoicing and tax handling in the new Svelte UI. This adds editable fields for billing identity and persists them through the existing organization data model rather than expanding the core organization patch contract.

• Billing settings UI

  • Adds a new Billing information section on the organization billing page.
  • Supports:
    • organization billing name
    • organization billing address
    • VAT number
    • VAT ID
  • Uses debounced autosave so edits persist without a separate save flow.

• Organization data persistence

  • Stores the new values in organization extended data using stable known keys.
  • Reuses the existing per-key organization data endpoints for create/update/delete behavior.
  • Removes keys when values are cleared instead of storing empty strings.

• Frontend organization API support

  • Adds Svelte-side helpers for posting and deleting organization data entries.
  • Updates organization query cache consistently across the existing organization query variants.

• Billing data normalization

  • Centralizes the billing data keys and extraction logic in a dedicated helper.
  • Normalizes whitespace-only values to null so UI behavior matches backend trim/delete semantics.

• Coverage

  • Adds focused frontend tests for billing data extraction and normalization.
  • Adds controller tests covering trimmed persistence and key removal for organization data.

export const organizationBillingInformationDataKeys = {
    name: "billing_name",
    address: "billing_address",
    vatNumber: "billing_vat_number",
    vatId: "billing_vat_id",
} as const;

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