Add frontend types and API client methods for region management

Adds RegionalTargetResponse, RegionalBudgetResponse,
RegionAgencyMapResponse, RegionalTaxRuleResponse,
RegionHierarchyResponse, and RegionDashboardResponse types, plus
setTarget/setBudget/mapAgency/setTaxRule/hierarchy/dashboard methods
on the regions API client, mirroring the new backend endpoints.

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

distribution_fe/lib/api/master.ts

@@ -2,6 +2,12 @@ import { api } from '@/lib/api'
 import type {
   PaginatedResponse,
   RegionResponse,
+  RegionalTargetResponse,
+  RegionalBudgetResponse,
+  RegionAgencyMapResponse,
+  RegionalTaxRuleResponse,
+  RegionHierarchyResponse,
+  RegionDashboardResponse,
   RouteResponse,
   VehicleResponse,
   WarehouseResponse,
@@ -96,6 +102,24 @@ export const regions = {
 
   remove: (id: string) =>
     api.delete(`/regions/${id}`),
+
+  setTarget: (id: string, period: string, targetValue: number) =>
+    api.put<RegionalTargetResponse>(`/regions/${id}/targets/${period}`, { targetValue }).then(r => r.data),
+
+  setBudget: (id: string, period: string, budgetAmount: number) =>
+    api.put<RegionalBudgetResponse>(`/regions/${id}/budgets/${period}`, { budgetAmount }).then(r => r.data),
+
+  mapAgency: (id: string, agencyUserId: string) =>
+    api.post<RegionAgencyMapResponse>(`/regions/${id}/agencies`, { agencyUserId }).then(r => r.data),
+
+  setTaxRule: (id: string, ruleConfig: string) =>
+    api.put<RegionalTaxRuleResponse>(`/regions/${id}/tax-rule`, { ruleConfig }).then(r => r.data),
+
+  hierarchy: (id: string) =>
+    api.get<RegionHierarchyResponse>(`/regions/${id}/hierarchy`).then(r => r.data),
+
+  dashboard: (id: string, period?: string) =>
+    api.get<RegionDashboardResponse>(`/regions/${id}/dashboard`, { params: { period } }).then(r => r.data),
 }
 
 // ─── Routes ───────────────────────────────────────────────────────────────────