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- Remove broken/outdated test files (network-dependent, stale expectations)

main.go

@@ -6,7 +6,7 @@ import (
 	"nofx/backtest"
 	"nofx/config"
 	"nofx/crypto"
-	"nofx/experience"
+	"nofx/telemetry"
 	"nofx/logger"
 	"nofx/manager"
 	"nofx/mcp"
@@ -194,5 +194,5 @@ func initInstallationID(st *store.Store) {
 	}
 
 	// Set installation ID in experience module
-	experience.SetInstallationID(installationID)
+	telemetry.SetInstallationID(installationID)
 }