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/internal/store/migrations/0003_destinations.sql

@@ -0,0 +1,15 @@
+-- FlowSight schema v3: per-user notification destinations (CRUD, dynamic per login).
+-- kind: telegram (bot_token+chat_id) or discord (webhook_url). Secrets live
+-- server-side only; API responses never include them.
+CREATE TABLE IF NOT EXISTS notification_destinations(
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  user_key TEXT NOT NULL,
+  kind TEXT NOT NULL,
+  label TEXT NOT NULL DEFAULT '',
+  bot_token TEXT NOT NULL DEFAULT '',
+  chat_id TEXT NOT NULL DEFAULT '',
+  webhook_url TEXT NOT NULL DEFAULT '',
+  enabled INTEGER NOT NULL DEFAULT 1,
+  created_at TEXT NOT NULL DEFAULT ''
+);
+CREATE INDEX IF NOT EXISTS idx_destinations_user ON notification_destinations(user_key, enabled);