feat: integrate quantitative, calendar, market data endpoints

Add 3 new service layers and route modules:
- quantitative_service: Sharpe ratio, CAPM, normality tests, unit root tests
- calendar_service: earnings/dividends/IPO/splits calendars, estimates, SEC ownership
- market_service: ETF, index, crypto, forex, options, futures data

Total endpoints: 50. All use free providers (yfinance, SEC).
Update README with comprehensive endpoint documentation.

main.py

@@ -9,6 +9,9 @@ from routes import router
 from routes_sentiment import router as sentiment_router
 from routes_macro import router as macro_router
 from routes_technical import router as technical_router
+from routes_quantitative import router as quantitative_router
+from routes_calendar import router as calendar_router
+from routes_market import router as market_router
 
 logging.basicConfig(
     level=settings.log_level.upper(),
@@ -33,6 +36,9 @@ app.include_router(router)
 app.include_router(sentiment_router)
 app.include_router(macro_router)
 app.include_router(technical_router)
+app.include_router(quantitative_router)
+app.include_router(calendar_router)
+app.include_router(market_router)
 
 
 @app.get("/health", response_model=dict[str, str])