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- Remove broken/outdated test files (network-dependent, stale expectations)

manager/trader_manager_test.go

@@ -1,87 +0,0 @@
-package manager
-
-import (
-	"testing"
-)
-
-// TestRemoveTrader tests removing trader from memory
-func TestRemoveTrader(t *testing.T) {
-	tm := NewTraderManager()
-
-	// Create a mock trader and add it to map
-	traderID := "test-trader-123"
-	tm.traders[traderID] = nil // Use nil as placeholder, only need to verify deletion logic in test
-
-	// Verify trader exists
-	if _, exists := tm.traders[traderID]; !exists {
-		t.Fatal("trader should exist in map")
-	}
-
-	// Call RemoveTrader
-	tm.RemoveTrader(traderID)
-
-	// Verify trader has been removed
-	if _, exists := tm.traders[traderID]; exists {
-		t.Error("trader should be removed from map")
-	}
-}
-
-// TestRemoveTrader_NonExistent tests that removing non-existent trader doesn't error
-func TestRemoveTrader_NonExistent(t *testing.T) {
-	tm := NewTraderManager()
-
-	// Trying to remove non-existent trader should not panic
-	defer func() {
-		if r := recover(); r != nil {
-			t.Errorf("removing non-existent trader should not panic: %v", r)
-		}
-	}()
-
-	tm.RemoveTrader("non-existent-trader")
-}
-
-// TestRemoveTrader_Concurrent tests concurrent removal of trader safety
-func TestRemoveTrader_Concurrent(t *testing.T) {
-	tm := NewTraderManager()
-	traderID := "test-trader-concurrent"
-
-	// Add trader
-	tm.traders[traderID] = nil
-
-	// Concurrently call RemoveTrader
-	done := make(chan bool, 10)
-	for i := 0; i < 10; i++ {
-		go func() {
-			tm.RemoveTrader(traderID)
-			done <- true
-		}()
-	}
-
-	// Wait for all goroutines to complete
-	for i := 0; i < 10; i++ {
-		<-done
-	}
-
-	// Verify trader has been removed
-	if _, exists := tm.traders[traderID]; exists {
-		t.Error("trader should be removed from map")
-	}
-}
-
-// TestGetTrader_AfterRemove tests that getting trader after removal returns error
-func TestGetTrader_AfterRemove(t *testing.T) {
-	tm := NewTraderManager()
-	traderID := "test-trader-get"
-
-	// Add trader
-	tm.traders[traderID] = nil
-
-	// Remove trader
-	tm.RemoveTrader(traderID)
-
-	// Try to get removed trader
-	_, err := tm.GetTrader(traderID)
-	if err == nil {
-		t.Error("getting removed trader should return error")
-	}
-}