Feature/custom strategy (#1172)

* feat: add Strategy Studio with multi-timeframe support
- Add Strategy Studio page with three-column layout for strategy management
- Support multi-timeframe K-line data selection (5m, 15m, 1h, 4h, etc.)
- Add GetWithTimeframes() function in market package for fetching multiple timeframes
- Add TimeframeSeriesData struct for storing per-timeframe technical indicators
- Update formatMarketData() to display all selected timeframes in AI prompt
- Add strategy API endpoints for CRUD operations and test run
- Integrate real AI test runs with configured AI models
- Support custom AI500 and OI Top API URLs from strategy config
* docs: add Strategy Studio screenshot to README files
* fix: correct strategy-studio.png filename case in README
* refactor: remove legacy signal source config and simplify trader creation
- Remove signal source configuration from traders page (now handled by strategy)
- Remove advanced options (legacy config) from TraderConfigModal
- Rename default strategy to "默认山寨策略" with AI500 coin pool URL
- Delete SignalSourceModal and SignalSourceWarning components
- Clean up related stores, hooks, and page components

docs/i18n/zh-CN/README.md

@@ -89,6 +89,10 @@
 ![详情页面](../../../screenshots/details-page.png)
 *专业交易界面，包含权益曲线、实时持仓、AI决策日志，支持展开查看输入提示词和AI思维链推理过程*
 
+### 🎛️ 策略工作室 - 自定义策略构建器
+![策略工作室](../../../screenshots/strategy-studio.png)
+*三栏式策略编辑器，支持多时间周期选择（5m/15m/1h/4h）、技术指标配置、风险控制设置，以及基于实时市场数据的AI测试运行*
+
 ---
 
 ## 🏦 支持的交易所（DEX/CEX教程）