Add query bar, maintenance panel, and heartbeat system

- Query bar with organized/grouped search results in portal
- Maintenance panel UI for triggering and viewing maintenance status
- Heartbeat service with periodic maintenance and dirty-tracking
- Query organizer for grouping search results by tag/kind/parent
- Slide-up animation for query panel

portal/src/api.ts

@@ -1,4 +1,4 @@
-import type { CortexNode, CortexEdge, GraphData, NodeWithConnections, SearchResult, NodeKind, EdgeType } from './types';
+import type { CortexNode, CortexEdge, GraphData, NodeWithConnections, SearchResult, NodeKind, EdgeType, GroupedQueryResult } from './types';
 
 const BASE = '/api';
 
@@ -41,4 +41,13 @@ export const api = {
 
   search: (text: string, options?: Record<string, any>) =>
     request<SearchResult[]>('/search', { method: 'POST', body: JSON.stringify({ text, options }) }),
+
+  queryOrganized: (text: string) =>
+    request<GroupedQueryResult>('/query/organize', { method: 'POST', body: JSON.stringify({ text }) }),
+
+  getMaintenanceStatus: () =>
+    request<Record<string, any>>('/maintenance/status'),
+
+  runMaintenance: () =>
+    request<Record<string, any>>('/maintenance/run', { method: 'POST' }),
 };