feat:거래처 선택 시 상세정보(대표자/주소/업태/종목/이메일) 자동 입력

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Http/Controllers/Finance/JournalEntryController.php

@@ -374,6 +374,10 @@ public function tradingPartners(Request $request): JsonResponse
                     'name' => $p->name,
                     'biz_no' => $p->biz_no,
                     'type' => $p->type,
+                    'category' => $p->category,
+                    'ceo' => $p->ceo,
+                    'address' => $p->address,
+                    'email' => $p->email,
                 ];
             }),
         ]);