Add live search to admin licenses overview

- Add AJAX handler for real-time license search
- Create admin-licenses.js with debounced search and keyboard navigation
- Display search results with highlighted matches
- Support navigation with arrow keys and Enter to select
- Add CSS for dropdown results styling

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

assets/css/admin.css

@@ -468,3 +468,114 @@
 .licenses-table .license-actions {
     width: 220px;
 }
+
+/* Live Search Styles */
+.wclp-live-search-results {
+    position: absolute;
+    top: 100%;
+    left: 0;
+    right: 0;
+    min-width: 400px;
+    max-width: 600px;
+    max-height: 400px;
+    overflow-y: auto;
+    background: #fff;
+    border: 1px solid #c3c4c7;
+    border-radius: 0 0 4px 4px;
+    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
+    z-index: 1000;
+}
+
+.wclp-live-search-results:empty {
+    display: none;
+}
+
+.wclp-search-result-item {
+    padding: 12px 15px;
+    border-bottom: 1px solid #f0f0f0;
+    cursor: pointer;
+    transition: background-color 0.15s ease;
+}
+
+.wclp-search-result-item:last-child {
+    border-bottom: none;
+}
+
+.wclp-search-result-item:hover,
+.wclp-search-result-item.active {
+    background-color: #f0f6fc;
+}
+
+.wclp-result-main {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 10px;
+    margin-bottom: 4px;
+}
+
+.wclp-result-key code {
+    font-size: 13px;
+    background: #f0f0f0;
+    padding: 2px 6px;
+    border-radius: 3px;
+}
+
+.wclp-result-key mark {
+    background-color: #fff8c5;
+    padding: 0;
+}
+
+.wclp-result-details {
+    display: flex;
+    gap: 15px;
+    font-size: 12px;
+    color: #646970;
+    margin-bottom: 2px;
+}
+
+.wclp-result-domain mark {
+    background-color: #fff8c5;
+    padding: 0;
+}
+
+.wclp-result-product {
+    color: #2271b1;
+}
+
+.wclp-result-customer {
+    font-size: 11px;
+    color: #8c8f94;
+}
+
+.wclp-result-customer small {
+    opacity: 0.8;
+}
+
+.wclp-search-loading,
+.wclp-search-no-results,
+.wclp-search-error {
+    padding: 15px;
+    text-align: center;
+    color: #646970;
+    font-size: 13px;
+}
+
+.wclp-search-loading .spinner {
+    float: none;
+    margin: 0 5px 0 0;
+    vertical-align: middle;
+}
+
+.wclp-search-error {
+    color: #d63638;
+}
+
+/* Search box positioning */
+.wclp-filter-form .search-box {
+    position: relative;
+}
+
+#license-search-input {
+    width: 280px;
+}