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/routes/indicator.py

@@ -709,7 +709,7 @@ IMPORTANT: Output Python code directly, without explanations, without descriptio
             reference_id=f"ai_code_gen_{user_id}_{int(time.time())}"
         )
         if not ok:
-            yield "data: " + json.dumps({"error": f"积分不足: {msg}"}, ensure_ascii=False) + "\n\n"
+            yield "data: " + json.dumps({"error": f"Insufficient credits: {msg}"}, ensure_ascii=False) + "\n\n"
             yield "data: [DONE]\n\n"
             return