feat: 예상 수입 월별 저장 + 계좌 순서변경 API

- 예상 수입: budget_income(연·월별) 로 변경, GET/PUT 에 year·month
- 계좌: wallet.sort_order + reorder 엔드포인트, 생성 시 맨 뒤 배치

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/main/java/com/sb/web/account/controller/AccountController.java

@@ -10,6 +10,7 @@ import com.sb.web.account.dto.NetWorthPoint;
 import com.sb.web.account.dto.NetWorthResponse;
 import com.sb.web.account.dto.PeriodStat;
 import com.sb.web.account.dto.RepaymentRequest;
+import com.sb.web.account.dto.WalletReorderRequest;
 import com.sb.web.account.dto.WalletRequest;
 import com.sb.web.account.dto.WalletResponse;
 import com.sb.web.account.service.AccountService;
@@ -69,6 +70,14 @@ public class AccountController {
         return ResponseEntity.noContent().build();
     }
 
+    /** 계좌/카드 순서 변경 (드래그앤드랍) */
+    @PutMapping("/wallets/reorder")
+    public List<WalletResponse> reorderWallets(
+            @RequestBody WalletReorderRequest req,
+            @RequestAttribute(AuthInterceptor.CURRENT_MEMBER) SessionUser current) {
+        return accountService.reorderWallets(current.getId(), req.getType(), req.getIds());
+    }
+
     @GetMapping("/networth")
     public NetWorthResponse netWorth(
             @RequestAttribute(AuthInterceptor.CURRENT_MEMBER) SessionUser current) {