feat(StockDataService): Add unified StockDataService and BaseProviderService with new stockdata interfaces, provider integrations, tests and README updates

ts/stocks/index.ts

@@ -2,10 +2,15 @@
 export * from './interfaces/stockprice.js';
 export * from './interfaces/provider.js';
 export * from './interfaces/fundamentals.js';
+export * from './interfaces/stockdata.js';
 
 // Export main services
 export * from './classes.stockservice.js';
 export * from './classes.fundamentalsservice.js';
+export * from './classes.stockdataservice.js'; // ✨ New unified service
+
+// Export base service (for advanced use cases)
+export * from './classes.baseproviderservice.js';
 
 // Export providers
 export * from './providers/provider.yahoo.js';