Phase 4: Economic Calendar API Integration

Implemented comprehensive economic calendar system for trading event alerts:

Backend (economic_calendar.py):
- GET /api/economic-calendar/events: Fetch events by days, countries, impact level
- GET /api/economic-calendar/today: Get today's scheduled events
- GET /api/economic-calendar/upcoming: Events within X hours (1-168)
- GET /api/economic-calendar/high-impact: Only critical events (next 30 days)
- GET /api/economic-calendar/by-country/{country}: Country-specific events
- GET /api/economic-calendar/impact-analysis: Gold trading impact analysis
- GET /api/economic-calendar/calendar-view: Calendar view with events by day
- POST /api/economic-calendar/events/{event_id}/notify: Set reminder notifications
- GET /api/economic-calendar/stats: Event statistics and busiest days

Features:
- Sample economic events: NFP, CPI, Unemployment, Fed Rate Decision, ECB Rate
- Impact levels: High/Medium/Low with color coding
- Forecast, previous, and actual values tracking
- Event filtering by country, impact, and days ahead
- Multiple sort options: date, importance, impact
- Notifications 15-120 minutes before events
- Gold trading correlation analysis
- Statistics for 7-day and 30-day windows

Frontend (EconomicCalendar.tsx):
- Calendar overview with event statistics
- Upcoming and high-impact event tabs
- Country-based filtering
- Impact-based color coding (red/yellow/blue)
- Event details: forecast, previous, actual values
- Trading tips for different event types
- Event time display with timezone consideration
- Correlation guidance (USD inverse, rates inverse)
- Visual indicators for pending/actual events

Integration:
- Registered economic_calendar router in main.py
- Added EconomicCalendar tab to App.tsx
- Integrated with navigation system
- Full TypeScript support

Note: Currently uses mock data. In production, integrate with:
- Trading Economics API
- Forexfactory Calendar
- Economic Calendar Pro
- OANDA Calendar

backend/app/main.py

@@ -7,7 +7,7 @@ from app.streaming.live_store import periodic_flush, periodic_maintenance
 import asyncio
 
 # Newly added routers
-from app.api import account, performance, status, settings_api, prompts, daily_helper, analytics
+from app.api import account, performance, status, settings_api, prompts, daily_helper, analytics, economic_calendar
 
 app = FastAPI(
     title=settings.APP_NAME,
@@ -43,6 +43,7 @@ app.include_router(settings_api.router, prefix="/api")
 app.include_router(prompts.router, prefix="/api")
 app.include_router(daily_helper.router)
 app.include_router(analytics.router)
+app.include_router(economic_calendar.router)
 
 
 @app.on_event("startup")