feat: add Citations and WatchlistChat components, integrate with API

- Implemented Citations component to display citation data.
- Created WatchlistDrawer and ChatSidebar components for managing watchlists and AI chat functionality.
- Integrated API calls for watchlist management and chat interactions.
- Updated index.tsx to include new components in the main application layout.
- Added API client in lib/api.ts for structured API interactions.
- Developed Alerts, Dashboard, Portfolio, Routines, Screener, and Report pages with relevant data fetching and UI components.
- Introduced styles in tokens.css for consistent theming across the application.
- Configured TypeScript and Vite for project setup and development.

backend/tests/fixtures/foreign_flow_bbca.json

@@ -0,0 +1,27 @@
+{
+ "symbol": "BBCA.JK",
+ "start": "2026-09-07",
+ "end": "2026-09-11",
+ "data": [
+  {
+   "date": "2026-09-07",
+   "net_foreign_inflow": 120000000000
+  },
+  {
+   "date": "2026-09-08",
+   "net_foreign_inflow": 95000000000
+  },
+  {
+   "date": "2026-09-09",
+   "net_foreign_inflow": 140000000000
+  },
+  {
+   "date": "2026-09-10",
+   "net_foreign_inflow": 80000000000
+  },
+  {
+   "date": "2026-09-11",
+   "net_foreign_inflow": 340000000000
+  }
+ ]
+}