feat: implement P-WAR system analysis and inquiries sorting functionality

style/inquiries.css

@@ -108,6 +108,42 @@
     z-index: 900;
 }
 
+/* 정렬 가능한 헤더 스타일 추가 */
+.inquiry-table thead th.sortable {
+    cursor: pointer;
+    user-select: none;
+    transition: background 0.2s;
+    white-space: nowrap;
+}
+
+.inquiry-table thead th.sortable .header-content {
+    display: flex;
+    align-items: center;
+    gap: 4px;
+}
+
+.sort-icon {
+    display: inline-flex;
+    flex-direction: column;
+    justify-content: center;
+    width: 12px;
+    height: 12px;
+    font-size: 8px;
+    color: #ccc;
+    line-height: 1;
+    margin-left: 2px;
+}
+
+.inquiry-table thead th.active-sort {
+    color: #1e5149;
+    background: #f0f7f6;
+}
+
+.inquiry-table thead th.active-sort .sort-icon {
+    color: #1e5149;
+    font-size: 10px;
+}
+
 .inquiry-table td {
     padding: 14px 16px;
     font-size: 13px;