feat: ga-core + ga-api + ga-batch + V13-V15 + Docker + frontend skeleton

ga-core (22 tables):
- user/role: VO + Mapper + XML (login + RBAC)
- org: Grade, Organization (CTE recursive tree), Agent + history
- product: InsuranceCompany, Product, Contract
- rule: CommissionRate, PayoutRule, OverrideRule, ChargebackRule, ExceptionTypeCode
- receive: CompanyProfile, FieldMapping, CodeMapping, RawCommissionData, ParseError
- ledger: Recruit, Maintain, Exception (batch insert + cursor)
- settle: SettleMaster (UPSERT), Override, Chargeback, Payment, Reconciliation, BatchJobLog
- All XMLs use EncryptTypeHandler for PII fields

ga-api:
- AuthController: login (lock on N fails), refresh, me, password, logout
- Domain controllers: Agent, Organization, Contract, Company, Product, Rule,
  Receive, Ledger (recruit/maintain/exception + approve), Settle (confirm/hold/release),
  Payment, User, Role (matrix), BatchTrigger
- All use @RequirePermission + @DataChangeLog

ga-batch:
- MonthlySettlementJob: 8 Steps (receiveData, transformData, reconcile,
  calcRecruit, calcMaintain, chargebackException, calcOverride, aggregate)
- DataReceiver strategy + ManualReceiver, MappingEngine stub
- CommissionCalculator (pct/tax via MoneyUtil), JobLauncherController

DB V13~V15:
- V13: 14 indexes (settle_master, ledgers, contract, chargeback, payment, raw, logs)
- V14: create_monthly_partition() helper function
- V15: v_agent_monthly_summary, v_org_settle_summary, v_chargeback_risk views

Infra:
- docker-compose: postgres + redis + api + batch + frontend
- Multi-stage Dockerfile (gradle build → JRE)

ga-frontend (skeleton):
- Vite + React 18 + TypeScript + AntD 5 + AG Grid + React Query + Zustand
- API request layer (axios + JWT), LoginPage, MainLayout (dynamic menu), Dashboard
- nginx.conf for /api proxying

ga-frontend/src/pages/LoginPage.tsx

@@ -0,0 +1,42 @@
+import { Button, Card, Form, Input, message } from 'antd';
+import { useNavigate } from 'react-router-dom';
+import { authApi } from '@/api/auth';
+import { useAuthStore } from '@/stores/auth';
+
+export default function LoginPage() {
+  const navigate = useNavigate();
+  const setAuth = useAuthStore((s) => s.setAuth);
+
+  const onFinish = async (values: { loginId: string; password: string }) => {
+    try {
+      const resp = await authApi.login(values);
+      localStorage.setItem('accessToken', resp.accessToken);
+      if (resp.refreshToken) localStorage.setItem('refreshToken', resp.refreshToken);
+      setAuth({
+        userId: resp.userId, loginId: resp.loginId,
+        userName: resp.userName, roles: resp.roles,
+      });
+      message.success(`${resp.userName}님 환영합니다`);
+      navigate('/');
+    } catch {
+      // 인터셉터에서 메시지 처리
+    }
+  };
+
+  return (
+    <div style={{ display: 'flex', justifyContent: 'center', alignItems: 'center',
+                  minHeight: '100vh' }}>
+      <Card title="GA 수수료 정산 솔루션" style={{ width: 400 }}>
+        <Form layout="vertical" onFinish={onFinish}>
+          <Form.Item label="아이디" name="loginId" rules={[{ required: true }]}>
+            <Input autoFocus />
+          </Form.Item>
+          <Form.Item label="비밀번호" name="password" rules={[{ required: true }]}>
+            <Input.Password />
+          </Form.Item>
+          <Button type="primary" htmlType="submit" block>로그인</Button>
+        </Form>
+      </Card>
+    </div>
+  );
+}