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/brokers_registry.json

@@ -0,0 +1,30 @@
+[
+ {
+  "code": "MG",
+  "name": "Semesta Indovest",
+  "is_foreign": false,
+  "cohort": "mixed",
+  "license_type": "broker"
+ },
+ {
+  "code": "AK",
+  "name": "UBS Sekuritas",
+  "is_foreign": true,
+  "cohort": "institutional",
+  "license_type": "broker"
+ },
+ {
+  "code": "CC",
+  "name": "Mandiri Sekuritas",
+  "is_foreign": false,
+  "cohort": "institutional",
+  "license_type": "broker"
+ },
+ {
+  "code": "BK",
+  "name": "JPMorgan Sekuritas",
+  "is_foreign": true,
+  "cohort": "institutional",
+  "license_type": "broker"
+ }
+]