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/company_report_bbca.json

@@ -0,0 +1,19 @@
+{
+ "symbol": "BBCA.JK",
+ "overview": {
+  "name": "Bank Central Asia"
+ },
+ "valuation": {
+  "pe_ratio": 24.5,
+  "pb_ratio": 4.8
+ },
+ "profitability": {
+  "roe": 0.21
+ },
+ "leverage": {
+  "debt_to_equity": 0.9
+ },
+ "dividend": {
+  "payout_ratio": 0.62
+ }
+}