style(admin): 비용 표시 제거 — 사내 LLM 은 단가 없어 항상 0. 토큰·응답시간만

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

2_frontend/src/features/admin/pages/AdminStatsPage.test.tsx

@@ -91,7 +91,6 @@ describe("AdminStatsPage", () => {
     asUser("ADMIN")
     mount()
     expect(await screen.findByText("1,500")).toBeTruthy() // 총 토큰
-    expect(screen.getByText("$0.1234")).toBeTruthy()
     expect(screen.getByText("2.5s")).toBeTruthy()
     expect(screen.getByText("김개발")).toBeTruthy()
     expect(client.apiGet).toHaveBeenCalledTimes(1)

2_frontend/src/features/admin/pages/AdminStatsPage.tsx

@@ -9,7 +9,6 @@ import { ApiError } from "@/lib/api/errors"
 import { useAdminStats } from "../api/admin.api"
 
 const fmtInt = (n: number) => n.toLocaleString("ko-KR")
-const fmtUsd = (n: number) => `$${n.toFixed(n < 1 ? 4 : 2)}`
 const fmtSec = (ms: number | null) => (ms === null ? "–" : `${(ms / 1000).toFixed(1)}s`)
 const isoDay = (d: Date) => d.toISOString().slice(0, 10)
 
@@ -20,7 +19,8 @@ const PRESETS: { label: string; days: number }[] = [
   { label: "90일", days: 90 },
 ]
 
-/** 관리자 대시보드 — 총 토큰·비용·응답시간 + 사용자별·일별. 서버는 ChatMessage 집계만(새로 모으는 것 없음). */
+/** 관리자 대시보드 — 총 토큰·응답시간 + 사용자별·일별. 서버는 ChatMessage 집계만(새로 모으는 것 없음).
+ *  비용은 안 보여줌 — 사내 LLM(FabriX) 은 단가가 없어 OpenCode 가 0 으로 줌. 단가 정해지면 그때 카드 추가. */
 export default function AdminStatsPage() {
   const navigate = useNavigate()
   const isAdmin = useAuthStore((s) => s.user?.role === "ADMIN")
@@ -86,7 +86,7 @@ export default function AdminStatsPage() {
       {t && (
         <>
           {/* 요약 카드 4개 */}
-          <div className="grid grid-cols-2 gap-2 sm:grid-cols-4">
+          <div className="grid grid-cols-3 gap-2">
             <Stat
               label="요청"
               value={fmtInt(t.requests)}
@@ -97,7 +97,6 @@ export default function AdminStatsPage() {
               value={fmtInt(t.totalTokens)}
               sub={`입력 ${fmtInt(t.inputTokens)} · 출력 ${fmtInt(t.outputTokens)}`}
             />
-            <Stat label="비용" value={fmtUsd(t.costUsd)} sub="OpenCode 집계 기준" />
             <Stat label="평균 응답" value={fmtSec(t.avgElapsedMs)} sub="첫 요청→완료" />
           </div>
 
@@ -115,7 +114,7 @@ export default function AdminStatsPage() {
                 {data.byDay.map((d) => (
                   <div
                     key={d.day}
-                    title={`${d.day}: ${fmtInt(d.totalTokens)} 토큰 · ${d.requests}건 · ${fmtUsd(d.costUsd)}`}
+                    title={`${d.day}: ${fmtInt(d.totalTokens)} 토큰 · ${d.requests}건`}
                     className="bg-primary/80 hover:bg-primary min-w-[4px] flex-1 rounded-sm transition-colors"
                     style={{ height: `${Math.max(2, (d.totalTokens / maxDayTokens) * 100)}%` }}
                   />
@@ -133,14 +132,13 @@ export default function AdminStatsPage() {
                   <th className="px-3 py-2 text-right font-semibold">요청</th>
                   <th className="px-3 py-2 text-right font-semibold">세션</th>
                   <th className="px-3 py-2 text-right font-semibold">토큰</th>
-                  <th className="px-3 py-2 text-right font-semibold">비용</th>
                   <th className="px-3 py-2 text-right font-semibold">평균 응답</th>
                 </tr>
               </thead>
               <tbody className="divide-border/70 divide-y">
                 {data.byUser.length === 0 && (
                   <tr>
-                    <td colSpan={6} className="text-muted-foreground py-6 text-center text-xs">
+                    <td colSpan={5} className="text-muted-foreground py-6 text-center text-xs">
                       기간 내 사용자 없음
                     </td>
                   </tr>
@@ -154,7 +152,6 @@ export default function AdminStatsPage() {
                     <td className="px-3 py-2 text-right tabular-nums">{fmtInt(u.requests)}</td>
                     <td className="px-3 py-2 text-right tabular-nums">{fmtInt(u.sessions)}</td>
                     <td className="px-3 py-2 text-right tabular-nums">{fmtInt(u.totalTokens)}</td>
-                    <td className="px-3 py-2 text-right tabular-nums">{fmtUsd(u.costUsd)}</td>
                     <td className="px-3 py-2 text-right tabular-nums">{fmtSec(u.avgElapsedMs)}</td>
                   </tr>
                 ))}