Project configuration view: manage a project's statuses

New /projects/:id/configure view, linked from a new 'Configure' item on
the project view's Manage menu.

Backend:
- CardStatusRepository/CardStatusController gain full CRUD: create
  (appended at the end), reorder (dense positions, like card
  ordering), and delete.
- Deleting a status with cards attached is rejected with 409 and
  error.details.card_count, rather than hitting the existing FK
  RESTRICT constraint -- retrying with { reassign_to: <status id> }
  moves those cards to that status first (CardRepository::
  reassignStatus, appended after the destination's existing cards)
  and deletes in one transaction (CardStatusRepository::transaction,
  shared PDO connection across repositories).
- The last status in a project can't be deleted, since a project card
  is required to have one.
- Routes: POST/DELETE .../statuses(/:id), PUT .../statuses/order.
- 14 new CardStatusTest cases covering all of the above.

Frontend:
- ProjectConfigureView.vue: header (title, back-to-project link, the
  shared Manage menu) + a vuedraggable status list (reorder persists
  the whole new order) with a delete button per row and an add-status
  form. A row's plain delete either succeeds immediately or, on 409,
  opens a modal to choose a different status before retrying the
  delete with reassign_to.
- Extracted ProjectManageMenu.vue (the Manage dropdown + delete-project
  modal) out of ProjectView so both views share it; it now also has a
  Configure link (hidden on the configure page itself).
- ApiError gains a cardCount getter (details.card_count), mirroring
  the existing retryAfter getter.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

web/src/lib/api.ts

@@ -30,6 +30,12 @@ export class ApiError extends Error {
     const value = (this.details as Record<string, unknown>).retry_after
     return typeof value === 'number' ? value : undefined
   }
+
+  /** How many cards are still using a status, when deleting one 409s pending reassignment. */
+  get cardCount(): number | undefined {
+    const value = (this.details as Record<string, unknown>).card_count
+    return typeof value === 'number' ? value : undefined
+  }
 }
 
 interface RequestOptions {