feat: delete task/account, edit endpoint, richer event log

- store: DeleteAccount, DeleteTask, UpdateEndpoint (+ cascade/update tests)
- httpapi: DELETE /tasks/{id}, DELETE /tasks/{id}/accounts/{accountId},
  PUT /endpoints/{id}; delete guarded with 409 while task running
- orchestrator: enrich WS events with login/host/port/error (test + run + errors)
- web: delete buttons (task, account) with confirm, endpoint edit form,
  human-readable event log (source/dest, host:port, error text)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MMHQTtnQtQqL8muAXHr9kd

web/src/api.ts

@@ -71,6 +71,16 @@ export const listEndpoints = () => api<Endpoint[]>('/api/endpoints')
 export const createEndpoint = (body: { role_label: string; host: string; port: number; tls_mode: TLSMode }) =>
   api<{ id: number }>('/api/endpoints', jsonBody(body))
 
+export const updateEndpoint = (
+  id: number,
+  body: { role_label: string; host: string; port: number; tls_mode: TLSMode },
+) => api(`/api/endpoints/${id}`, { ...jsonBody(body), method: 'PUT' })
+
+export const deleteTask = (id: number) => api(`/api/tasks/${id}`, { method: 'DELETE' })
+
+export const deleteAccount = (taskId: number, accountId: number) =>
+  api(`/api/tasks/${taskId}/accounts/${accountId}`, { method: 'DELETE' })
+
 export const listTasks = () => api<Task[]>('/api/tasks')
 
 export const getTask = (id: number) => api<TaskDetail>(`/api/tasks/${id}`)