feat(frontend): 누락된 메뉴 14개 페이지 일괄 구현

신규 페이지 (모두 ProTable / ProCard 패턴):
- org/OrgTree: 조직 트리 + 선택 시 우측에 소속 설계사 ProTable
- product/CompanyList: 보험사 목록
- product/ProductList: 상품 목록 (보험종 필터)
- rule/CommissionRateList: 수수료율 (보험사 통보)
- rule/PayoutRuleList: 지급율 (직급 × 보험종 × 회차)
- rule/OverrideRuleList: 오버라이드 규정 (직급 페어)
- rule/ChargebackRuleList: 환수 규정 (실효 월수 구간)
- rule/ExceptionCodeList: 예외 코드 마스터
- ledger/MaintainLedger: 유지수수료 원장
- receive/ReceiveData: 보험사 raw 수신 데이터
- receive/ReceiveMapping: 보험사 프로파일 + 필드 매핑 규칙
- system/MenuManage: 메뉴 트리 표시 (Tree)
- system/SystemConfig: 키-값 설정 (그룹별 필터)
- system/SystemLog: 로그인/API/변경 이력 3 탭

신규 API 모듈:
- api/org.ts (조직 트리)
- api/company.ts, api/product.ts
- api/rule.ts (5종 통합)
- api/receive.ts (profile/field/raw/error)
- api/config.ts, api/log.ts

App.tsx: 14 라우트 추가 (org/tree, companies, products, rules/*,
receive/*, ledger/maintain, system/menus, system/config, system/logs)

검증:
- tsc -b 통과
- 12개 백엔드 엔드포인트 200 OK 확인
- dev 서버 HMR 자동 반영

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

ga-frontend/src/api/rule.ts

@@ -0,0 +1,79 @@
+import api, { unwrap } from './request';
+
+export interface CommissionRateResp {
+  rateId: number;
+  productId: number;
+  productName?: string;
+  commissionYear: number;
+  ratePct: number;
+  payMethodCond?: string;
+  minPremium?: number;
+  effectiveFrom?: string;
+  effectiveTo?: string;
+  version: number;
+}
+
+export interface PayoutRuleResp {
+  ruleId: number;
+  gradeId: number;
+  gradeName?: string;
+  insuranceType: string;
+  commissionYear: number;
+  payoutPct: number;
+  payMethodCond?: string;
+  performanceGrade?: string;
+  effectiveFrom?: string;
+  effectiveTo?: string;
+  version: number;
+}
+
+export interface OverrideRuleResp {
+  overrideId: number;
+  fromGrade: number;
+  toGrade: number;
+  fromGradeName?: string;
+  toGradeName?: string;
+  overridePct: number;
+  calcType?: string;
+  insuranceTypeCond?: string;
+  capAmount?: number;
+  effectiveFrom?: string;
+  effectiveTo?: string;
+}
+
+export interface ChargebackRuleResp {
+  cbRuleId: number;
+  companyCode: string;
+  insuranceType: string;
+  lapseMonthFrom: number;
+  lapseMonthTo: number;
+  cbRate: number;
+  includeOverride: string;
+  installmentAllowed: string;
+  maxInstallments?: number;
+  effectiveFrom?: string;
+  effectiveTo?: string;
+}
+
+export interface ExceptionCodeResp {
+  exceptionCode: string;
+  exceptionName: string;
+  category?: string;
+  direction: string;
+  autoCalcYn: string;
+  approvalRequired: string;
+  taxIncluded: string;
+  description?: string;
+  isActive: string;
+}
+
+export const ruleApi = {
+  commissionRates: (params?: { productId?: number; year?: number }) =>
+    unwrap<CommissionRateResp[]>(api.get('/api/rules/commission-rates', { params })),
+  payoutRules: (params?: { gradeId?: number; insuranceType?: string }) =>
+    unwrap<PayoutRuleResp[]>(api.get('/api/rules/payout', { params })),
+  overrideRules: () => unwrap<OverrideRuleResp[]>(api.get('/api/rules/override')),
+  chargebackRules: (params?: { companyCode?: string }) =>
+    unwrap<ChargebackRuleResp[]>(api.get('/api/rules/chargeback', { params })),
+  exceptionCodes: () => unwrap<ExceptionCodeResp[]>(api.get('/api/rules/exception-codes')),
+};