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

store/system_config.go

@@ -36,13 +36,9 @@ func (s *SystemConfigStore) initDefaultData() error {
 	configs := map[string]string{
 		"beta_mode":            "false",
 		"api_server_port":      "8080",
-		"use_default_coins":    "true",
-		"default_coins":        `["BTCUSDT","ETHUSDT","SOLUSDT","BNBUSDT","XRPUSDT","DOGEUSDT","ADAUSDT","HYPEUSDT"]`,
 		"max_daily_loss":       "10.0",
 		"max_drawdown":         "20.0",
 		"stop_trading_minutes": "60",
-		"btc_eth_leverage":     "5",
-		"altcoin_leverage":     "5",
 		"jwt_secret":           "",
 		"registration_enabled": "true",
 	}