Add configurable data providers and localize frontend UI

backend/data/mock_price_manager.py

@@ -9,6 +9,7 @@ import random
 import threading
 import time
 from typing import Callable, Dict, List, Optional
+from backend.data.provider_utils import normalize_symbol
 
 logger = logging.getLogger(__name__)
 
@@ -69,6 +70,7 @@ class MockPriceManager:
     ):
         """Subscribe to stock symbols"""
         for symbol in symbols:
+            symbol = normalize_symbol(symbol)
             if symbol not in self.subscribed_symbols:
                 self.subscribed_symbols.append(symbol)
 
@@ -90,6 +92,7 @@ class MockPriceManager:
     def unsubscribe(self, symbols: List[str]):
         """Unsubscribe from symbols"""
         for symbol in symbols:
+            symbol = normalize_symbol(symbol)
             if symbol in self.subscribed_symbols:
                 self.subscribed_symbols.remove(symbol)
                 self.base_prices.pop(symbol, None)