chore: document project-wide soft delete pattern and add deleted_by column to all tables

devplacepy/static/css/admin.css

@@ -28,6 +28,51 @@
     color: var(--text-muted);
 }
 
+.admin-tabs {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 0.5rem;
+    margin-bottom: 1.25rem;
+}
+
+.admin-tab {
+    display: inline-flex;
+    align-items: center;
+    gap: 0.4rem;
+    padding: 0.4rem 0.85rem;
+    border-radius: var(--radius-sm, 6px);
+    border: 1px solid var(--border-color);
+    color: var(--text-muted);
+    font-size: 0.8125rem;
+    font-weight: 600;
+}
+
+.admin-tab:hover {
+    color: var(--text-color);
+    border-color: var(--accent-color);
+}
+
+.admin-tab.active {
+    color: var(--accent-color);
+    border-color: var(--accent-color);
+    background: var(--accent-soft, rgba(127, 127, 127, 0.08));
+}
+
+.admin-tab-count {
+    font-size: 0.6875rem;
+    padding: 0.05rem 0.4rem;
+    border-radius: 999px;
+    background: var(--bg-muted, rgba(127, 127, 127, 0.15));
+    color: var(--text-muted);
+}
+
+.admin-table-actions {
+    display: flex;
+    gap: 0.5rem;
+    justify-content: flex-end;
+    white-space: nowrap;
+}
+
 .admin-table-wrap {
     overflow-x: auto;
 }