feat(costs): add billing, quota, and budget control plane

ui/src/api/budgets.ts

@@ -0,0 +1,20 @@
+import type {
+  BudgetIncident,
+  BudgetIncidentResolutionInput,
+  BudgetOverview,
+  BudgetPolicySummary,
+  BudgetPolicyUpsertInput,
+} from "@paperclipai/shared";
+import { api } from "./client";
+
+export const budgetsApi = {
+  overview: (companyId: string) =>
+    api.get<BudgetOverview>(`/companies/${companyId}/budgets/overview`),
+  upsertPolicy: (companyId: string, data: BudgetPolicyUpsertInput) =>
+    api.post<BudgetPolicySummary>(`/companies/${companyId}/budgets/policies`, data),
+  resolveIncident: (companyId: string, incidentId: string, data: BudgetIncidentResolutionInput) =>
+    api.post<BudgetIncident>(
+      `/companies/${companyId}/budget-incidents/${encodeURIComponent(incidentId)}/resolve`,
+      data,
+    ),
+};