fix(pmr): 용량 컬럼 줄바꿈 방지 (white-space: nowrap)

backend/templates/pmr.html

@@ -895,6 +895,7 @@
             font-weight: 600;
             font-size: 0.9rem;
             display: inline-block;
+            white-space: nowrap;
         }
         .med-form { 
             background: #fef3c7;