feat(phase1): admin 견적 리스트 발주 뱃지 + 진행 상태 라벨 확장

- status 타입에 'in_progress' | 'completed' | 'delivered' 추가
- STATUS 맵 확장: 3개 신규 상태 추가 및 accepted 라벨 변경
  * accepted: '수락 · 발주' (기존 녹색)
  * in_progress: '진행중 · 발주' (파란색)
  * completed: '완료 · 발주' (에메랄드)
  * delivered: '납품 완료 · 발주' (틸)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/admin/quotes/page.tsx

@@ -9,7 +9,7 @@ interface Quote {
   title: string;
   client_name: string;
   client_email: string;
-  status: 'draft' | 'sent' | 'accepted' | 'rejected';
+  status: 'draft' | 'sent' | 'accepted' | 'rejected' | 'in_progress' | 'completed' | 'delivered';
   valid_until: string | null;
   public_token: string;
   items: { unitPrice: number; quantity: number; optional: boolean }[];
@@ -19,8 +19,11 @@ interface Quote {
 const STATUS = {
   draft:        { label: '초안', color: 'bg-slate-700 text-slate-300' },
   sent:         { label: '발송됨', color: 'bg-blue-900/50 text-blue-400' },
-  accepted: { label: '수락됨', color: 'bg-green-900/50 text-green-400' },
+  accepted:     { label: '수락 · 발주', color: 'bg-green-900/50 text-green-400' },
   rejected:     { label: '거절됨', color: 'bg-red-900/50 text-red-400' },
+  in_progress:  { label: '진행중 · 발주', color: 'bg-blue-900/50 text-blue-400' },
+  completed:    { label: '완료 · 발주', color: 'bg-emerald-900/50 text-emerald-400' },
+  delivered:    { label: '납품 완료 · 발주', color: 'bg-teal-900/50 text-teal-400' },
 };
 
 function calcTotal(items: Quote['items']) {