Add admin order management with full status workflow.

internal/handlers/static/css/admin.css

@@ -188,6 +188,55 @@
     color: #9ca3af;
 }
 
+.admin-alert--ok {
+    background: #d1fae5;
+    color: #065f46;
+    border: 1px solid #a7f3d0;
+}
+
+.admin-table__muted {
+    font-size: 0.8rem;
+    color: #9ca3af;
+}
+
+.admin-table--orders td {
+    vertical-align: top;
+}
+
+.admin-order-details td {
+    background: #f9fafb;
+    font-size: 0.85rem;
+    color: #6b7280;
+    padding-top: 0 !important;
+}
+
+.admin-order-items {
+    margin: 8px 0 0;
+    padding-left: 18px;
+}
+
+.admin-status-form {
+    display: flex;
+    gap: 8px;
+    align-items: center;
+}
+
+.admin-form__input--sm {
+    padding: 8px 10px;
+    font-size: 0.85rem;
+    min-width: 140px;
+}
+
+.admin-status-legend {
+    margin-top: 32px;
+}
+
+.admin-status-legend__grid {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 8px;
+}
+
 .admin-hint code {
     background: #e5e7eb;
     padding: 2px 6px;