feat: restructure navigation, customize list columns, and move action buttons to search bar

1. Restructured navigation hierarchy (Hardware, Software, Ops Support, etc.).
2. Customized table columns for all asset categories according to new specs.
3. Moved Template/Upload/Export/Add buttons to search bar with layout optimization.
4. Hidden Asset Code and Previous User from list views (Modal only).
5. Added Current/Previous User and detailed PC spec fields (GPU, HDD3/4).

src/styles/table.css

@@ -3,9 +3,9 @@
 .search-bar {
   display: flex;
   flex-wrap: wrap;
-  gap: 1.25rem;
-  padding: 1.5rem 0; /* 좌우 패딩 제거, 상하 여백 유지 */
-  border-bottom: 1px solid var(--border-color); /* 하단 구분선만 남김 */
+  gap: 0.75rem; /* 간격 축소 및 통일 */
+  padding: 1.2rem 0;
+  border-bottom: 1px solid var(--border-color);
   align-items: flex-end;
   margin-bottom: 0.5rem;
 }
@@ -17,7 +17,19 @@
 }
 
 .search-item.flex-1 {
-  flex: 1;
+  flex: 1; /* 검색창이 남은 공간을 채우도록 설정 */
+  min-width: 250px;
+}
+
+.search-actions {
+  display: flex;
+  gap: 0.5rem; /* 버튼들 간의 간격 */
+  align-items: center;
+}
+
+.search-actions .btn {
+  height: 38px;
+  padding: 0 1rem;
 }
 
 .search-item label {
@@ -50,13 +62,13 @@
 
 /* 필터 초기화 버튼 크기 조정 (입력창 높이 38px에 맞춤) */
 .btn-reset {
-  margin-left: auto;
   height: 38px !important;
   color: var(--text-muted) !important;
   padding: 0 1.2rem !important;
   display: inline-flex;
   align-items: center;
   justify-content: center;
+  margin-left: 0; /* 불필요한 마진 제거 */
 }
 
 .table-container {