refactor: split large files and clean up project structure

- Rename experience/ to telemetry/ for clarity
- Split 15+ large Go files (800-2200 lines) into focused modules:
  kernel/engine.go, backtest/runner.go, market/data.go, store/position.go,
  api/handler_trader.go, trader/auto_trader_grid.go, and 9 exchange traders
- Split frontend monoliths: types.ts, api.ts, AITradersPage.tsx, BacktestPage.tsx
  into domain-specific modules with barrel re-exports
- Remove stale files: screenshots, .yml.old, pyproject.toml
- Remove unused scripts/ and cmd/ directories
- Remove broken/outdated test files (network-dependent, stale expectations)

provider/alpaca/kline_test.go

@@ -1,35 +0,0 @@
-package alpaca
-
-import (
-	"context"
-	"fmt"
-	"testing"
-)
-
-func TestGetBars(t *testing.T) {
-	client := NewClient()
-
-	resp, err := client.GetBars(context.TODO(), "AAPL", "1Day", 5)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	t.Log("=== AAPL 日线数据 (Alpaca IEX feed) ===")
-	for i, bar := range resp {
-		t.Logf("\n[%d] 时间: %s", i, bar.Timestamp.Format("2006-01-02 15:04:05"))
-		t.Logf("    Open:       %.2f", bar.Open)
-		t.Logf("    High:       %.2f", bar.High)
-		t.Logf("    Low:        %.2f", bar.Low)
-		t.Logf("    Close:      %.2f", bar.Close)
-		t.Logf("    Volume:     %d (股数)", bar.Volume)
-		t.Logf("    TradeCount: %d (成交笔数)", bar.TradeCount)
-		t.Logf("    VWAP:       %.2f (成交量加权平均价)", bar.VWAP)
-
-		// 计算成交额
-		quoteVolume := float64(bar.Volume) * bar.Close
-		t.Logf("    成交额:     %.2f USD (Volume × Close)", quoteVolume)
-	}
-
-	fmt.Printf("\n⚠️ 注意：IEX feed 只包含 IEX 交易所的数据，不是完整市场数据\n")
-	fmt.Printf("完整市场数据需要使用 SIP feed（付费）\n")
-}