feat(trading-assistant): refactor strategy creation and enhance script mode functionality

- Removed conditional rendering for the assistant guide bar.
- Simplified strategy overview and strategy list item components.
- Introduced a new modal for selecting strategy mode.
- Enhanced strategy creation modal to support script strategies with a dedicated editor.
- Updated form handling for script strategies, including validation and submission logic.
- Improved user experience with better messaging and streamlined UI components.
- Updated translations for better clarity in Chinese.

backend_api_python/app/data_sources/polymarket.py

@@ -160,7 +160,7 @@ class PolymarketDataSource:
             return None
     
     def get_market_history(self, market_id: str, days: int = 30) -> List[Dict]:
-        """获取市场历史价格数据"""
+        """Get historical market price data."""
         # Here you need to implement historical data acquisition logic
         # Temporarily returns an empty list
         return []
@@ -374,7 +374,7 @@ class PolymarketDataSource:
             return []
     
     def _get_cached_markets(self, category: str = None, limit: int = 50) -> Optional[List[Dict]]:
-        """从数据库缓存读取市场数据"""
+        """Read market data from the database cache."""
         try:
             with get_db_connection() as db:
                 cur = db.cursor()