feat: 도매상 로고 아이콘 적용 (이모지 → 실제 로고)

- 지오영: favicon.ico 사용
- 수인: 커스텀 SVG (보라색 '수' 아이콘)
- static/img/ 폴더에 로고 저장

backend/static/img/logo_sooin.ico

@@ -0,0 +1,3 @@
+<script type="text/javascript">
+location.href = "./homepage/intro.asp";
+</script>

backend/static/img/logo_sooin.svg

@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32">
+  <rect width="32" height="32" rx="6" fill="#7c3aed"/>
+  <text x="16" y="22" text-anchor="middle" fill="white" font-family="Arial" font-weight="bold" font-size="16">수</text>
+</svg>

backend/templates/admin_rx_usage.html

@@ -1376,7 +1376,7 @@
         // ═══════ 지오영 섹션 ═══════
         html += `<div class="ws-section">
             <div class="ws-header geoyoung">
-                <span class="ws-icon">🏭</span>
+                <img class="ws-logo" src="/static/img/logo_geoyoung.ico" alt="지오영">
                 <span class="ws-name">지오영</span>
                 <span class="ws-count">${geoItems.length}건</span>
             </div>`;
@@ -1411,7 +1411,7 @@
         // ═══════ 수인약품 섹션 ═══════
         html += `<div class="ws-section">
             <div class="ws-header sooin">
-                <span class="ws-icon">💊</span>
+                <img class="ws-logo" src="/static/img/logo_sooin.svg" alt="수인">
                 <span class="ws-name">수인약품</span>
                 <span class="ws-count">${sooinItems.length}건</span>
             </div>`;
@@ -1741,8 +1741,11 @@
         background: linear-gradient(135deg, rgba(168, 85, 247, 0.2), rgba(124, 58, 237, 0.1));
         border-left: 3px solid var(--accent-purple);
     }
-    .ws-icon {
-        font-size: 18px;
+    .ws-logo {
+        width: 24px;
+        height: 24px;
+        border-radius: 4px;
+        object-fit: contain;
     }
     .ws-name {
         flex: 1;